Question

A boy of mass 30 kg is running with a speed of 4m/s in 5second . what is the rate of doing work
A. 240w . B. 120w
C. 150w. D.48w​

Answer 1

Explanation:

Let the distance of 40 kg. from the mean position be 'x' m.

Using principle of moments,

30×2=40×x

x=1.5m.

A boy of mass 40 kg should sit at 1.5m from the middle of see-saw.