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Three identical spheres lie at rest alon...

Three identical spheres lie at rest along a line on a smooth horizontal surface. The separation between any two adjacent spheres is L. The first sphere is moving with a velocity u towards the second sphere at time t = 0. The coefficient of restitution for a collision between any two blocks is `1/3` The correct statement is

A

The third sphere will start moving at `t=(5L)/(2u)`

B

The third sphere will start moving at `t=(4L)/(u)`

C

The centre of mass of the system will have a final speed 2u

D

The centre of mass of the system will have of final speed u

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The correct Answer is:
A
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