Q.

A perfectly elastic ball Q1 of mass m moving with velocity v collides elastically with three exactly similar balls Q2,Q3,Q4 lying on a smooth table as shown. Velocities of the four balls after the collision are

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a

v, v, v, v

b

0, 2v, 3v, 4v

c

0,0,0,v

d

0,0,0,0

answer is C.

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Detailed Solution

When a body collides another identical body at rest the body comes to rest and second body moves with the velocity of Ist body OR When masses are same in ellastic collision, velocities are exchanged
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A perfectly elastic ball Q1 of mass m moving with velocity v collides elastically with three exactly similar balls Q2,Q3,Q4 lying on a smooth table as shown. Velocities of the four balls after the collision are