Question

the work done when a force of 20 N displaces a body through 8 m in the direction of the applied force is: 

Answer 1

By definiton, the work of a constant force is:

$$W = Fs$$

where $F = 20N$ is the applied force and $s = 8m$ is the displacement in the direction of the applied force. Thus, obtain:

$$W = 20N\cdot 8m = 160J$$

Answer. 160 J.