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CBSE Class 11-science Answered

WORK, POWER,ENERGY:
Asked by | 15 Feb, 2009, 08:22: PM
answered-by-expert 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 | 16 Feb, 2009, 11:52: AM
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