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a ball A moving with velocity v collides with identical ball B initially at rest. collision...

a ball A moving with velocity v collides with identical ball B initially at rest. collision is perfectly elastic in frictionless environment. Velocity of ball A after collision will be:

a. v

b. -v

c. 0

d. v/2

e. -v/2

The answer is c. 0. Please help me understand how to get to this answer. Thank you!

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