Question

What is negative work?

Answer 1

work done is said to be negative if force and displacement are acting in opposite direction. in this case the angle between force and displacement is 180°

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Answer 2

The work that is done can be positive work or negative work depending on whether the force doing the work is directed opposite the object's motion or in the same direction as the object's motion. If the force and the displacement are in the same direction, then positive work is done on the object.