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Q.

A man (mass =50 kg ) and his son (mass =20 kg ) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of  0.70 ms−1  with respect to the man. The speed of the man with respect to the surface is:

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a

0.47 ms−1

b

0.28 ms−1

c

0.14 ms−1

d

0.20 ms−1

answer is B.

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Detailed Solution

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Pi=Pf 
or  0=20(0.7−v)−50v
or  v=0.2 m/s

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