Question

A boy is pulled 20m along a horizontal plane with a constant force of 10 N, applied (I) parallel to the plane( II) in direction of angle 60° to the horizontal calculate the work done in each case

Answer 1

$W_1=Fs\cos\alpha=10\cdot20\cdot\cos0°=200(J)$ . Answer

$W_2=Fs\cos\alpha=10\cdot20\cdot\cos60°=100(J)$ . Answer