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A set of n identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is L. The block at one end is given a speed v towards the next one at time t=0 . All collisions are completely inelastic, then

(a)      The last block starts moving at  t=(n-1)L/v

(b)  The last block starts moving at  t=n(n-1)L/2v

(c)   The centre of mass of the system will have a final speed  v

(d)  The centre of mass of the system will have a final speed  v/n

Answer: b

(8)

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