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Sahay Sir > Question Answers > MTG NEET Physics > Part 1 > Chapter 6 - Work, Energy and Power > A running man has the same kinetic energy as that of a boy of half his mass. The man speeds up by 2ms^−1 and the body changes his speed by x m s^−1 so that the kinetic energies of the boy and the man are again equal. Then x in ms^−1 is

A running man has the same kinetic energy as that of a boy of half his mass. The man speeds up by 2ms^−1 and the body changes his speed by x m s^−1 so that the kinetic energies of the boy and the man are again equal. Then x in ms^−1 is

A force F=6i+2j-3k acts on a particle and produces a displacement of s=2i-3j-xk . if the work done is zero the value of x is