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Question

A body of mass 'M' moving with a speed of 'u' has a head-on collision with a body of mass 'm' originally at rest. If M >> m, then the speed of the body of mass 'm' after the collision, will be nearly

A
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B
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C
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D
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Solution

The correct option is D
If two objects of masses m1 and m2 collide elastically moving with velocities , velocitiesu1 and u2 after collision will be
v1=(m1m2m1+m2)u1+2m2u2m1+m2 and v2=(m2m1m1+m2)u2+2m1u1m1+m2
If m1 >> m2,v1=u1 and v2=2u1u2
As, u1=u and u2=0.velocity of target after collision would be 2u

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