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UPSC Civil Service Exam Questions - Engineering

Q1:

A heavy elastic ball drops from the ceiling of a room, and after rebounding once from the floor, reaches a height equal to three-fourth of that of the ceiling. The coefficient of restitution will be

A

B

C

D

ANS:B -

The coeff of restitution = vel of separation/vel.of approach = √(1.5xgxh/2xgxh) = √(3/4).