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.