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 m/s with respect to the man. The speed of the man with respect to the surface is:

A man (mass = 50 kg) and his son (mass = 20 kg) are standing on a fric

1.	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 m/s with respect to the man. The speed of the man with respect to the surface is:
A.	0.28 ms-1
B.	0.20 ms-1
C.	0.47 ms-1
D.	0.14 ms-1
Answer» C. 0.47 ms-1

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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 m/s with respect to the man. The speed of the man with respect to the surface is:

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