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Initially car A is 10.5 m ahead of car B...

Initially car `A` is `10.5 m` ahead of car `B`. Both start moving at time `t = 0` in the same direction along a straight line. The velocity-time graph of two cars is shown in figure. The time when the car `B` will catch the car `A`, will be.

A

t=21 sec

B

t=`2sqrt(5)sec`

C

20 sec

D

none of these

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The correct Answer is:
A
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MOTION-KINEMATICS-EXERCISE 2 OBJECTIVE PROBLEMS
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  2. If a point moves in a straigth line in such a manner that its retardat...

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  3. Initially car A is 10.5 m ahead of car B. Both start moving at time t ...

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  4. Statement-I : A particle moves in a straight line with constant accele...

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  5. Assertion: For a particle moving in a straight line velocity (v in m//...

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  6. A particle moves along x-axis and its acceleration at any time t is a ...

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  7. A particle moves along x-axis and its acceleration at any time t is a ...

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  8. A particle moves along x-axis and its acceleration at any time t is a ...

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  9. A particle moves along x-axis and its acceleration at any time t is a ...

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  10. A point mass is projected, making an acute angle with the horizontal. ...

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  11. A projectile is thorwn with a velocity of 50ms^(-1) at an angle of 53^...

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  12. A projectile is thorwn with a velocity of 50ms^(-1) at an angle of 53^...

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  13. A projectile is thorwn with a velocity of 50ms^(-1) at an angle of 63^...

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  14. A particle is projected form a horizontal plane (x-z plane) such that ...

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  15. A ball is thrown form a point on a ground at some angle of projection....

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  16. A projectile is fired with a speed u at an angle theta with the horizo...

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  17. At t=0 a projectile is fired from a point O (taken as origin) on the g...

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