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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 4 - Work, Energy and Power > 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 :

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 :

A body of mass m=10−2kg is moving in a medium and experiences a frictional force F=−KV^2. Its initial speed is υ0=10ms^−2. If after 10s its energy is 1/8mυ^2 0 the value of k will be