Give one example each in which a force does (a) positive work (b)… - Vidyadip

Question

Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.

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Answer

Positive work: Work done by the force applied by a person on a ball that is thrown upwards.
Negative work: Work done by gravitational force of earth on a ball thrown upwards.
Zero work: Work done by gravitational force of earth on a box that is sliding horizontally on the ground.

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