When a force retards the motion of a body

When a force retards the motion of a body, what is the nature of work done by force? State reason. list two examples of such a situation.

The nature of work done in case of retarding motion is negative.
Suppose a force F brings a body moving with velocity v to rest (retards), then work done = change in KE = KEf = KEi
W = 0 - 1/2 m ${{u}^{2}}$ = 1/2 m ${{u}^{2}}$