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 $
