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A ball of mass M moving with a velocity V collides head on elastically with another of same mass but moving with a velocity v in the opposite direction. After collision,

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one ball comes to rest and another ball travels back with velocity 2V

both the balls come to rest

both of them move at right angles to the original line of motion

the velocities are exchanged between the two balls

answer is A.

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Detailed Solution

In elastic identical mass collision, velocities are exchanged

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