A body moves by 8m when it is subjected to some force. If 80N force is applied and the angle between the force and displacement is $90°$ then find the work on the body by the given force.

Given:
Force = 80 N, Displacement =8 m  and $\theta ={90}^o$

Work is done when a force acts upon an object to cause a displacement.
The mathematical expression for work done is :
$\mathrm{W}=\mathrm{Fs} \mathrm{cos\theta }$
$\Rightarrow \mathrm{W}=80\times 8\times \cos 90°$
$\because$$\cos 90°=0$ 
$\Rightarrow \mathrm{W}=0\mathrm{J}$

Therefore, the work done on the object by the given force will be 0 J.