Question

According To this Definition
Work done W=Force × Displacement covered in the direction of Force

Define Negative Workdone.​

Answer 1

Negative work occurs when the force acting on an object is opposite in direction to the displacement. So when you lower the book, you are applying an upwards force to it, but its displacement is downwards.

Answer 2

Heya frnd!!!☺

If the force has a component in the direction opposite to the displacement,

then the force does negative work.

hope it helps♥