product of weight and vertical displacement of a body is an expression for
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Answer:
work done/energy expended against/by force of weight
Explanation:
weight = mg (near surface of earth)
displacement = s (either vertically upwards or downwards)
let theta be the angle between displacement vector and force vector
since displacement vertical, theta = 0 or 180
Work = weight (force by gravity) . displacement
= mgscos(theta)
= mgs or -mgs
(depending on direction of vertical displacement, work done by external force or by gravity)
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