Recent questions tagged class-11

A ball is dropped from the roof of a building . An observer notes that the ball takes $0.1$ s to cross over a window 1 m in height . After crossing the window , the ball takes another 1.00 s to come to the bottom of the building . What is height of the building and how high is the window. Take $g=10 ms^{-2}$

asked Jul 25, 2014 by meena.p

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A body X is dropped from a vertical height of 200 m. Exactly at the same instant another body -Y is projected vertically upwards with a velocity of $100 ms^{-1}$. When and where the two bodies X and Y meet?

asked Jul 25, 2014 by meena.p

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Drops are falling at regular intervals of time from the roof of a building 16 m high. If the first drop reaches the ground at the instant the fifth drop start falling, find the heights of the various drops at the instant the first drop reaches the ground ?

asked Jul 25, 2014 by meena.p

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A juggler is maintaining four balls in motion, making each in turn to rise to height of 20 m.Where will other three balls be at the instant, When one is just leaving his hand? $g= 10ms^{-2}$

asked Jul 25, 2014 by meena.p

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A juggler is maintaining four balls in motion, making each in turn to rise to height of 20 m. With what velocity does he project them ?

asked Jul 25, 2014 by meena.p

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A body is projected vertically upward with a velocity $20 ms^{-1}$ . Find the distance travelled by it in 3 s. Take $g=10ms^{-2}$.

asked Jul 25, 2014 by meena.p

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A particle is projected vertically up and it reaches a 15 cm high mark at certain instant. After 4 seconds from this instant the particle crosses this mark again in its downward journey. What is the initial velocity of projection of this particle? $(g= 10 ms^{-2})$

asked Jul 25, 2014 by meena.p

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A body travels 2 m in the first two seconds and $2.2 \;m$ in the next four seconds. What will be its velocity at the end of the seventh second from the start, if acceleration is constant .

asked Jul 18, 2014 by meena.p

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A Car is able to stop with a uniform retardation of $8 ms^{-2} $ and the driver of the car can react to an emergency in 0.6 s. Calculate overall stopping distance of the car if the speed of car is $72 \;km\;h^{-1}$

asked Jul 18, 2014 by meena.p

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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