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UPSC Civil Service Exam Questions - Engineering

Q1:

A ball of mass 1 kg moving with a velocity of 2 m/s collides directly with a stationary ball of mass 2 kg and comes to rest after the impact. The velocity of the second ball after impact will be

A 0

B 1 m/s

C 2 m/s

D 4 m/s

ANS:B - 1 m/s

Explain the answer.