Question

A horizontal force F applied to an object varies with its displacement. (Force is 4.0) Calculate the work done by the force when the object moves from x =0 to x=10.0m.

Answer 1

By the definition of the work done, we have:

$$W=Fd.$$

Let's first find the displacement of the object:

$$d=x_f-x_i=10\ m-0\ m=10\ m.$$

Finally, we can find the work done by the force:

$$W=4\ N\times 10\ m=40\ J.$$