When is the work done by a body said to be negative
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when displacement of the body is in direction opposite to direction of force e.g. when a person lifts a weight then the displacement of the body is in direction opposite to Gravitational Force and thus it can be said that the work done on the body by gravity is NEGATIVE (angle between Gravitational Force and Displacement is 180 degree and cos 180 = -1).
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when displacement of the body is in direction opposite to direction of force ....
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