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A bag (mass M) hangs by a long thred and...

A bag (mass M) hangs by a long thred and a bullet (mass m) comes horizontally with velocity v and gets caught in the bag. Then for the combined (bag+bullet) system -

A

Momentum is (mMv)/(M+m)

B

Kinetic energy is `1/2 Mv^2 `

C

Momentum is` (mv(M+m))/M`

D

Kinetic energy is` (m^2v^2)/(2(M+m))`

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The correct Answer is:
D
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