Two bodies of masses 3kg and 5kg moving with velocities 2...
Two bodies of masses 3kg and 5kg moving with velocities 2 m/s and V m/s respectively in opposite directions collide. If they move together after collision with velocity 3.5 m/s in the direction of the 5kg mass, find the value of V.
7.8 m/s
6.8 m/s
5.6 m/s
4.6 m/s
Correct answer is B
Since the bodies are in an opposite direction, one takes the negative velocity.
m1v1+m2v2=(m1+m2)v (Momentum when the two bodies move in the same direction after collision)
3(−2)+5(V)=(3+5)3.5
−6+5V=28⟹5V=34;V=6.8m/s
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