how can be workdone be negative
Asked by | 24th Dec, 2009, 05:16: PM
Work done is a dot product of two vectors, force and displacement. So as force and displacement need not be always positive and in the same direction, we can have negative work done.
For example, when we lift up some object from ground the force acting the gravity in downward direction and displacement in the vertical direction.
Answered by | 24th Dec, 2009, 06:40: PM
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