Answer to Question #267410 in Physics for grey tyrant

Question

Three warehouse workers are moving a heavy crate from the warehouse to the truck. Looking at them from a top-down view, worker A pulls the box to the North with a force of 10N, worker B pulls the box to the West with a force of 17N, and worker C pulls the box to the South with a force of 20N. The box moves a total of 18m, 20° S of W with the force of the workers. What is the work done by Worker C?

Answer 1

The work done by Worker C:

$$W_C=Fd\cos\theta=20·18\cos20°=338\text{ J}.$$