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A body of mass 2 kg makes an elastic col...

A body of mass 2 kg makes an elastic collision with a second body at rest and continues to move in the original direction but with one fourth of its original speed. What is the mass of the second body?

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Verified by Experts

The correct Answer is:
1.2

COM gives : `2v_(0)=2xx(v_(0))/(4) +mv` ...(1)
For elastic collision `v-(v_(0))/(4)=v_(0)` ...(2)
From (1) and (2) `m=1.2 kg`
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