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A ball moving with a velocity v hits a m...

A ball moving with a velocity `v` hits a massive wall moving towards the ball with a velocity a. An elastic impact lasts for time `/_\t`

A

The average elastic force acting on the ball is `(m(u+v))/(Deltat)`

B

The average elastic force acting on the ball is `(2m(u+v))/(Deltat)`

C

The kinetic energy of the ball increases by 2mu (u + v)

D

The kinetic energy of the ball remains the same after the collision.

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The correct Answer is:
B, C
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MOTION-CENTRE OF MASS-Exercise - 2 (Level-II)
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  2. A particle of mass m moving horizontal with v(0) strikes a smooth wedg...

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  3. A particle of mass m moving horizontal with v(0) strikes a smooth wedg...

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  4. A particle of mass m moving horizontal with v(0) strikes a smooth wedg...

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  5. A particle of mass m moving horizontal with v(0) strikes a smooth wedg...

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  6. Two identical balls are interconnected with a massless and inextensibl...

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  8. Figure shows three identical blocks 1,2 & 3 each of mass m kept on fri...

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  9. Two blocks A and B each of mass m are connected by a light spring of n...

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  10. Two blocks of mass m(1) and m(2), resting on a frictionless table, are...

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  11. For a two body system in absence of external forces, the kinetic ener...

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  13. A bullet of mass m travelling horizontally with speed u strikes a wood...

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  14. In a one dimensional collision between two identical particles A and B...

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  15. Two identical spheres A and B are free to move and I, rotate about the...

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  16. A variable force acts on a body of mass m (initially at rest) from t =...

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  17. A thin uniform rod of mass m and length l is free to rotate about its ...

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  18. A ball moving with a velocity v hits a massive wall moving towards the...

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  19. A particle moving with kinetic energy=3 J makes an elastic head-on col...

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  20. In an inelastic collision,

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