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CBSE - IX - Physics - Force and Laws of Motion

2 bodies of masses 'm' and '3m', moving with velocities 3v and v respectively along same direction, collide with each other. After collision they stick together and move with a velocity V in the same direction. Then:
A) V=v
B) V=3/2v
D) V=4/3v

Asked by adityaahuja099 12th October 2017, 11:39 PM
Answered by Expert


Initial momentum of both bodies m×3v + 3m×v = 6×m×v
after collision combined mass is 4×m
By conservation of momentum, momentum after collision is 6×m×v
so velocity after collision is fraction numerator 6 cross times m cross times v over denominator 4 space cross times space m end fraction space equals space 3 over 2 v
Answered by Expert 13th October 2017, 12:04 PM

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