Work Energy And Power Question 163

Question: A moving body of mass m and velocity 3 km/h collides with a rest body of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity [CBSE PMT 1996; JIPMER 2001, 02]

Options:

A) 3 km/h

B) 2 km/h

C) 1 km/h

D) 4 km/h

Show Answer

Answer:

Correct Answer: C

Solution:

Initial momentum = $ m\times 3+2m\times 0=3m $

Final momentum = $ 3m\times V $

By the law of conservation of momentum $ 3m=3m\times V $

therefore $ V=1\ km/h $



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