1.

A boy of mass 80 kg is running at 10 m/s. Find the work done by him.

Answer»

Work done = Kinetic Energy possessed by a body. 

Kinetic Energy = \(\frac{mv^2}{2}\)

Given 

Mass (m) = 80 Kg; 

Velocity (v) = 10 m/s;

Kinetic Energy = \(\frac{80\times10^2}{2}\)

⇒ Kinetic Energy = \(\frac{8000}{2}\) = 4000 J

Hence the work done is 4000 J.


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