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Q.

A lighter body collides head-on and elastically with heavier body at rest then after collision

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a

Lighter body comes to rest, then heavier body begins to move with initial velocity of lighter body

b

The velocity of lighter sphere is reversed and the final velocity of heavier sphere approximately remains zero

c

Both lighter and heavier bodies exchange their velocities

d

Both lighter and heavier bodies come to rest

answer is B.

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Detailed Solution

mv1+Mv2=mu1+M×0……(1)v2−v1u1−u2=e=1….(2)∴v1=m−MM+mu1 and v2=2mM+m×u1For M>>m, v1 is negative and v2 =0
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