Sarah uses and included plane to load a chest into her truck. If she does 84 Joules of work, and the inclined plane is 4 meters long,
how much force does she expend?
336 N
21 N
28 N
84 N
In physics, work is defined as force times distance. The formula for work is:
Work = Force x Distance
Given that Sarah does 84 Joules of work on the inclined plane that is 4 meters long, we can rearrange the formula to solve for force:
Force = Work / Distance
Force = 84 J / 4 m
Force = 21 N
Therefore, Sarah expended 21 N of force to load the chest into her truck using the inclined plane. So the answer is 21 N.