Q.

An object of mass 2 kg is moving with a velocity of 3 m/s and collide head-on with an object B of mas 1 kg moving in the opposite direction with a velocity of 4 m/s. After collision both objects coalesce so that they move with a common velocity v equal to

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a

1 m/s

b

2 m/s

c

3 m/s

d

23 m/s

answer is D.

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Detailed Solution

Applying the law of conservation of momentum2×3−1×4=(2+1)v 2=3v  or  V=2/3m/s
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An object of mass 2 kg is moving with a velocity of 3 m/s and collide head-on with an object B of mas 1 kg moving in the opposite direction with a velocity of 4 m/s. After collision both objects coalesce so that they move with a common velocity v equal to