Ask Questions, Get Answers
Menu
X
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
studyplans
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
mobile
exams
ask
sample papers
teach
pricing
sign-in
Download our FREE mobile app with 1000+ tests for CBSE, JEE MAIN, AIPMT
X
Search
Topics
Want to ask us a question?
Click here
Browse Questions
Student Questions
Ad
Home
>>
JEEMAIN and AIPMT
>>
Physics
>>
Class11
>>
Motion in a Straight Line
0
votes
The position of a particle moving along the $x$-axis ($x$ is in $m$) is given by $x = t^3 - 3t^2 + 2t$. Find the velocity of the particle at $t=2\;s$.
speed-and-velocity
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
easy
Share
asked
Aug 12, 2014
by
balaji.thirumalai
Please
log in
or
register
to add a comment.
Can you answer this question?
Do not ask me again to answer questions
Please
log in
or
register
to answer this question.
1 Answer
0
votes
Answer: 2 m/s
Given $x = t^3 - 3t^2 + 2t$.
Velocity $v(t) = \large\frac{dx}{dt}$$ = 3t^2 - 6t + 2$
$\Rightarrow v(2) = 3 \times 2^2 - 6 \times 2 + 2 = 2\;m/s$
answered
Aug 12, 2014
by
balaji.thirumalai
Please
log in
or
register
to add a comment.
Related questions
0
votes
1
answer
The position of a particle moving along the $x$-axis ($x$ is in $m$) is given by $x = t^3 - 3t^2 + 2t$. Find the average speed of the particle in the interval $t=2\;s \rightarrow t = 4\;s$
asked
Aug 12, 2014
by
balaji.thirumalai
cl52417
speed-and-velocity
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
easy
0
votes
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
jeemain
physics
class11
ch3
kinematics
motion-in-a-straight-line
speed-and-velocity
easy
0
votes
1
answer
A particle moves along a semicircle of radius 10 m in 5 seconds. The average velocity of the particle in m/s is?
asked
Jun 20, 2013
by
meena.p
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
speed-and-velocity
q7
easy
0
votes
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
jeemain
physics
class11
unit2
kinematics
motion-in-a-straight-line
speed-and-velocity
easy
0
votes
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
jeemain
physics
class11
unit2
kinematics
motion-in-a-straight-line
speed-and-velocity
difficult
0
votes
1
answer
The displacement x of a particle varies with time 't' as $x=ae^{-\alpha t}+b e^{\beta t}$ where $a,b,\alpha, \beta$ are positive constants. The velocity of the particle will
asked
Jun 23, 2013
by
meena.p
jeemain
physics
class11
unit2
kinematics
motion-in-a-straight-line
speed-and-velocity
medium
0
votes
1
answer
Two boys are standing at ends A and B of a ground where AB=a. The boy at B starts running in a direction perpendicular to AB with a velocity v$_1$. The boy at A starts running simultaneously with velocity v and catches the other boy in a boy in a time t. Calculate t in terms of a, v and v$_1$.
asked
Jun 21, 2013
by
meena.p
jeemain
physics
class11
ch3
kinematics
motion-in-a-straight-line
speed-and-velocity
easy
Ask Question
SUBMIT QUESTION
►
Please Wait
Take Test
JEEMAIN Crash Practice
15 Test Series
AIPMT Crash Practice
5 Test Series
JEEMAIN
350+ TESTS
AIPMT
320+ TESTS
CBSE XI MATH
50+ TESTS
CBSE XII MATH
80+ TESTS
x
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...