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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 ms –1 with respect to the man. The speed of the man with respect to the surface is :

1. 0.28 ms –1
2. 0.47 ms –1
3. 0.20 ms –1
4. 0.14 ms –1

Correct answer: 0.20 ms –1

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