a box resrs on a horizontal frictionless surface. A girl pushes on the box with a force of 18 N to the right and a boy pushes on to the box with a force of 12 N to th left. The box moves 40m to the right. Find the work done by (a) the girl, (b) the boy, and (c) the net force.
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Net force acting on the box = 18-12
= 4 N towards right. (Answer of part c)
Work = Force X Displacement X cos(theta)
a) Work done by girl = 4N X 40m X cos 180°
= 160 Joule
b) Work done by boy = -4N X 40m X cos 180°
= -160 Joule
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