Sally, who weighs 450 N, stands on a skate board while Roger pushes it forward 13.0 m at constant velocity on a level straight street. He applies a constant 100 N force.
A) The work Roger does on the skateboard is 0 J.
B) The work Roger does on the skateboard is 1 300 J.
C) The work Sally does on the skateboard is 1 300 J.
D) The work Sally does on the skateboard is 5 850 J.
E) The work Roger does on the skateboard is 5 850 J.

Question

Quizplus · Accepted Answer

Work is calculated as the product of the force applied in the direction of motion and the displacement. Since Roger applies a 100 N force over a distance of 13.0 m, the work done is $100 \, \text{N} \times 13.0 \, \text{m} = 1300 \, \text{J}$.

Sally, Who Weighs 450 N, Stands on a Skate Board