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In a smooth stationary cart of length d,...

In a smooth stationary cart of length d, a small block is projected along it's length with velocity `upsilon` towards front. Coefficient of restitution for each collision is e. The cart rests on a smooth ground and can move freely. The time taken by block to come to rest w.r.t. cart is :

A

`(ed)/((1-e) upsilon)`

B

`(ed)/((1+e) upsilon)`

C

`(d)/(e )`

D

infinite

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The correct Answer is:
D
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