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Q.

A moving body of mass m and velocity 3 km/h collides with a rest body of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity (km/h)

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Detailed Solution

Initial momentum =  m×3+2m×0=3mFinal momentum =  3m×VBy the law of conservation of momentum 3m=3m×V⇒V=1 km​/​h
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