a Porter lifts a luggage from the ground and put it on his head. when is the work done by a force on a body said to be positive or negative?
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Step-by-step explanation:
Work done by an object = potential energy stored in an object.
i.e W = mgh (where g= 10m/s²)
∴ When the force and displacement are in the same direction, we call the work as positive but when the force and displacement are in opposite direction, we call the work as negative.
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