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A body of mass ‘m’ moving with a velocity ‘u’ collides elastically with another body at rest and continues

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A body of mass ‘m’ moving with a velocity ‘u’ collides elastically with another body at rest and continues to move in the original direction with a speed u/2. Find the mass of the second body.

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We have

m1 =  m2 = x (say)

u1 = u  u2 = 0

v1 = u/2

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