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WORK, POWER,ENERGY:

Asked by 15th February 2009, 8:22 PM
Answered by Expert
Answer:

Work done by man is positive as force and displacement are in the same direction.

Work done by gravitation is negative as force and displacement are in opposite directions.

Work done by friction is negative as friction acts up the plane as the body slides down the place.

Answered by Expert 16th February 2009, 11:52 AM
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