Question

A body collides with another body at rest..How to derive their final velocities

Answer 1

Suppose that mass is”M” and the body which is at rest is”m”

Now the body is at rest it's weigh=mg

Second body which is moving at speed “V” it's momentum=MV

A body which is at rest have momentum equal to it's weight

MV=mg

Now after collision it's velocity becomes half

MV/2 =mg

MV=2mg

Or m=MV/2g

Now coming to theory if a body collides elasticity with another body it's velocity can't be HALF so double check ur question