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UPSC Civil Service Exam Questions - Engineering

Q1:

A body of mass 4 kg moving at 12 m/s collides with another body of mass 8 kg and adheres to it. The resultant velocity of the total mass in m/s will be

A 4.0

B 5.0

C 6.0

D 7.0

ANS:A - 4.0

m1v1 + m2v2 = (m1+m2)v,
V2 = 0.