Question

What is the work done when the displacement of the body is in the opposite direction to that of the applied force?

Answer 1

The work done is negative because the force and displacement are in opposite directions.

W = F s cosθ 

When displacement is opposite to the applied force,

θ = 180° 

W = F s cosθ 180°

= −Fs

Therefore, when a body moves opposite to the applied force, the work done by the force is negative.