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Q.

A ball of mass m moving with a velocity v→ collides head on elastically with another of the same mass m but moving with a velocity -v→ . After collision.

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a

the velocities are exchanged between the balls

b

both the balls come to rest

c

both of them move at right angles to original direction of motion

d

one ball comes to rest and the other ball travels back with velocity 2v

answer is A.

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Detailed Solution

After collision also the two balls will move in opposite directions with a magnitude of velocity v (they will Separate from one another). Simply velocities will be exchange.
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