Recent questions tagged motion-in-a-straight-line

Straight from rest and moving with a constant acceleration , a body covers certains distance L in time t. What is the time taken by the body to cover the second half portion of this journey ?

asked Jul 18, 2014 by meena.p

1 answer

Telegraphic poles along a straight railway track are spaced at regular intervals of $90\;m$. A passenger in the train observes the successive pole pass at time intervals of 3 and 2 seconds respectively , find the acceleration of the train assuming it to be uniform .

asked Jul 18, 2014 by meena.p

1 answer

A train travels first one third of the distance on a straight track with velocity$10km h^{-1}$ next one third with velocity $20 kmh^{-1}$ and the last portion with velocity $60 kmh^{-1}$. What is the average velocity of the train for the whole journey ?

asked Jul 18, 2014 by meena.p

1 answer

If a ball is thrown vertically upwards with speed u, the distance covered during the last t second of its ascent is

asked Jul 18, 2014 by meena.p

1 answer

A particle is dropped vertically from rest from a certain height. Time taken by it to fall through successive distance of one metre each will be :

asked Jul 18, 2014 by meena.p

1 answer

A stone is thrown vertically up from the top of a tower with some initial velocity and it arrives on the ground after $t_1$ seconds. Now if the same the stone is thrown vertically down from the top of the same tower with the same initial velocity, it arrives on ground after $t_2$ seconds. In how much time will the stone take to reach the ground if it is dropped from the same tower?

asked Jul 17, 2014 by meena.p

1 answer

A particle is projected vertically upwards . It attains a height h after 2 seconds and again after 10 seconds . The speed of the particle at the height h is numerically equal to

asked Jul 17, 2014 by meena.p

1 answer

A body is projected vertically upwards. If $ t_1$ and $t_2$ be the times at which it is at height h above the point of projection while ascending and descending respectively. then h is,

asked Jul 17, 2014 by meena.p

1 answer

If the speed of a truck is reduced to one third of its original value, the minimum distance required to stop will be

asked Jul 17, 2014 by meena.p

1 answer

A particle starts from the position of rest under a constant acceleration. If travels a distance x in the first 10 seconds and distance y in the next 20 seconds . Then

asked Jul 10, 2014 by meena.p

1 answer

The greatest acceleration or deceleration that a train may have is $\alpha$ .The minimum time in which the train can get from one station to the next at a distance S is

asked Jul 10, 2014 by meena.p

1 answer

The front point of a train moving with constant acceleration crosses a signal post with velocity u and the end point of the train crosses the signal post with velocity v. With what velocity the middle point of the train crosses the signal post ?

asked Jul 10, 2014 by meena.p

1 answer

A car travels along straight road for the first half-time with a velocity $v_1$ and the second half-time with velocity $v_2$ The average velocity of cars is

asked Jul 10, 2014 by meena.p

1 answer

An open lift is moving upward with velocity $10 m/s$. It has an upward acceleration of $2 m/s^2$ . A ball is projected upward with velocity $20 m/s$ relative to ground. Find the time when ball meets the lift

asked Jul 3, 2013 by meena.p

1 answer

A particle moves a distance x in time t according to equation $x=(t+5)^{-1}$ acceleration of particle is proportional to

asked Jul 3, 2013 by meena.p

1 answer

A bus is moving with a speed of $10 m/s$ on a straight road. A scooterist wishes to overtake the bus in $100 s$. If the bus is at a distance of $1 \;km$ from the scooterist with what speed should the scooterist chase the bus?

asked Jul 3, 2013 by meena.p

1 answer

A ball takes t seconds to fall from height $h_1$ and $2t$ seconds to falls from height $h_2$.Then $h_1/h_2$ is

asked Jul 3, 2013 by meena.p

1 answer

A particle starts from rest from top of a smooth inclined plane of a given base. The time of fall is least when inclination of the plane to horizontal is

asked Jul 3, 2013 by meena.p

1 answer

A police jeep is chasing with velocity $45 km/hr$ a thief in another jeep moving with velocity $153\;km/hr$. The police fires a bullet with muzzle velocity 0f $180\; m/s$. The velocity with which it will strike the car of the thief is

asked Jul 3, 2013 by meena.p

1 answer

A stone is dropped from top of a tower when it crosses a point 5 m below the top, another stone is let fall from a point 25 m below the top. Both stones reach the bottom of tower simultaneously. The height of tower is $(g=10 m/s^2)$

asked Jul 2, 2013 by meena.p

1 answer

Two diamonds begin a free fall from rest from same height $1.0 \; sec$ apart How long after will the two diamonds be 10 m apart ? $(g=10 m/s)$

asked Jul 2, 2013 by meena.p

1 answer

Two trains each having speed $30 km/hr$ are leading towards each other on the same straight track. A bird can fly at $ 60 km/hr$ flies off one train when they are $60 km$ apart and heads directly for the other train. On reaching other train it files directly back to first and so on. How many trips can the bird fly from one train to another before the trains crash?

asked Jul 2, 2013 by meena.p

1 answer

A rocket is fired vertically up from the ground with a resultant vertical acceleration of $10 m/s^2$. The fuel is finished in 1 minute. and it continuous to move up. What is the maximum height reached?

asked Jul 2, 2013 by meena.p

1 answer

An open lift is moving upward with velocity $10 m/s$. It has an upward acceleration of $2 m/s^2$ . A ball is projected upward with velocity $20 m/s$ relative to ground. What is displacement of lift and ball at a time when ball meets the lift.

asked Jul 2, 2013 by meena.p

1 answer

Velocity of a particle moving in a straight line varies with its displacement as $v=(\sqrt {4 +4s}) m/s$. Displacement of particle at time t=0 is s=0. The displacement of particle at time t=2s is

asked Jul 2, 2013 by meena.p

1 answer

The acceleration of a particle moving in a straight line varies with its displacement as $a=2s$ velocity of particle is zero at zero displacement. The corresponding velocity displacement equation is

asked Jul 2, 2013 by meena.p

1 answer

Ball A is dropped from top of a building. At same instant ball B is thrown vertically upwards from ground. When the balls collide, they were moving in opposite directions and speed of A is twice the speed of B. At what fraction of the height of building did the collision occur

asked Jul 1, 2013 by meena.p

1 answer

A ball is dropped from the roof of a tower of height h.The total distance covered by it in the last second of its motion is equal to the distance covered by it in first three seconds.The value of h is $(g=10 m/s^2)$

asked Jul 1, 2013 by meena.p

1 answer

A particle is released from rest from a tower of height 3h, the ratio of time of fall for equal heights h ie $t_1:t_2:t_3$ is

asked Jul 1, 2013 by meena.p

1 answer

A train starts from station A with uniform acceleration $\alpha$ for some distance and then goes with uniform retardation $\beta$ for some more time to come to rest at station B.The distance between station A and B is 4 km. and the train takes 4 minutes to complete this journey. If $\alpha$ and $\beta$ are in $km/min^2$ then

asked Jun 28, 2013 by meena.p

1 answer

The displacement of a body is given to be proportional to the cube of time elapsed. The magnitude of acceleration of the body is

asked Jun 28, 2013 by meena.p

1 answer

A man moves along x axis such that velocity $v=\large\frac{1}{x}$. If he is initially at $x=2 m$ find the time when he reaches $x=4m$

asked Jun 28, 2013 by meena.p

1 answer

The figure gives the speed-time graph of the motion of a car. What is the ratio of the distance travelled by car during the last two seconds to total distance travelled in seven seconds

asked Jun 27, 2013 by meena.p

1 answer

The velocity of a particle is given by $v=5-t^2 m/s.$ The average acceleration of the particle between 3 and 5 seconds will be

asked Jun 27, 2013 by meena.p

1 answer

Average velocity of a particle moving in a straight line, with constant acceleration a, initial velocity u, time t is

asked Jun 27, 2013 by meena.p

1 answer

An elevator car whose floor to ceiling distance is 2.7 m starts ascending with constant acceleration of $1.2 m/s^2$ after 2 seconds of the start a bolt begins falling from ceiling of elevator. What is the time after which the bolt hits the floor of the elevator.

asked Jun 27, 2013 by meena.p

1 answer

A particle is dropped from point A at a certain height from ground. It falls freely and passes through three points B,C and D with BC=CD.Time taken for particle to move from B to C is 2 seconds and from C to D is 1 second. Time taken to move from A to B is

asked Jun 26, 2013 by meena.p

1 answer

A juggler maintains four balls in motion making each of them raise to a height of 20m from his hand.What time interval should he maintain, for the proper distance between them $(g=10 m/s^2)$

asked Jun 26, 2013 by meena.p

1 answer

In a car race, car A takes less time to finish than car B and passes finishing point with a velocity $v_0$ more than velocity of car B and $t_0$ time earlier than car B. The cars starts from rest and travel with acceleration $a_1$ and $a_2$ respectively. Then ratio of $\large\frac{v_0}{t_0}$ is

asked Jun 26, 2013 by meena.p

1 answer

Two particles start moving from the same point in a straight line. The first moves with constant velocity v and second moves with constant acceleration a. During the time that elapses before the second catches the first, the greatest distance between the particle is

asked Jun 26, 2013 by meena.p

1 answer

A particle is projected vertically from a point A on ground. It takes time $t_1$ to reach point B but still continous to move up. It takes further $t_2$ time to reach the ground from point B. Height of point B from the ground is

asked Jun 26, 2013 by meena.p

1 answer

The velocity time (v-t) graph of a moving object is given by the following figure. The maximum acceleration is

asked Jun 25, 2013 by meena.p

1 answer

A particle is moving in x-y plane with $y=\large\frac{x}{2}$ and $v_x=4-2t$. The displacement versus time of the particle would be

asked Jun 25, 2013 by meena.p

1 answer

A ball is dropped from a certain height on a horizontal floor. The coefficient of restitution between ball and floor is $\large\frac{1}{2}$. The displacement time graph of the ball is

asked Jun 25, 2013 by meena.p

1 answer

A 2m wide truck is moving with a uniform speed of $v_0=8 m/s$ along a staright horizontal road. A pedestrian starts to cross the road with a uniform speed of v when the truck is 4m away from him. The minimum value of 'v' so that he can cross the road safely is

asked Jun 25, 2013 by meena.p

1 answer

Two cars start off to race with velocities 4m/s and 2 m/s and travel in straight line with uniform acceleration $1\; m/s^2$ and $2 m/s^2$ respectively. If they reach the final point at same time, then the length of path is

asked Jun 25, 2013 by meena.p

1 answer

A body travelling along a straight line traversed one third of the total distance with velocity 4 m/s. The remaining part of distance was covered with a velocity $2 m/s$ for half the time and with velocity 6 m/s for other half of time. the mean velocity averaged over whole time of motion.

asked Jun 25, 2013 by meena.p

1 answer

A particle starts from rest at $t=0$ and undergoes an acceleration 'a' in $m/s^2$ with 't' in sec as shown

asked Jun 25, 2013 by meena.p

1 answer

$v_A=(x \hat i+6 \hat j) m/s,v_B=(3 \hat i+2 \hat j) m/s$ find x such that the relative speed of A with respect to B becomes 5 m/s

asked Jun 25, 2013 by meena.p

1 answer

For a motion with constant acceleration which is/are correct?

asked Jun 25, 2013 by meena.p

1 answer

Ask Questions, Get Answers