Question

when does the work is said to be negative?
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Answer 1

Answer:

Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work.

Answer 2

Answer:

when displacement is opposite to the direction of applied force then work done is said to be negative