JAMB - Physics (2007 - No. 28)
A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at the angle of 60o to the floor. The work done after a distance of 3m is
3 J
4 J
5 J
6 J
Giải thích
Work done by this force : 60
F cos 60 x X
= 2 x 0.5 x 3
= 3J