lift an object up . work is done by the force exerted by you on the object . the object moves upwards . the force you exerted is in the direction of displacement. however, there is the force of gravity acting on the object. which one of these forces is doing positive work ? which one is doing negative work ? give reasons .
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Force of tension on a ball moving in a circle on the end of a string. Normal force and gravitational force on an object at rest or moving across a level floor.
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