The sign of work done by …
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The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative
(a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.
(b) work done by friction on a body sliding down an inclined plane.
(c) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity
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