A horizontal force of 100 N is applied to move a 45-kg cart across a 9.0-m level surface.What work is done by the 100-N force?
A)405 J
B)500 J
C)900 J
D)4 500 J

Question

Quizplus · Accepted Answer

Work = force x distance x cosine of angle between force and displacement
In this case, the force is horizontal and the displacement is also horizontal, so the angle between them is 0 degrees and cosine of 0 is 1. 
Work = 100 N x 9.0 m x 1 = 900 J.

A Horizontal Force of 100 N Is Applied to Move