no work is done when a) a donkey is carrying a load on its back b) an engine is pulling a train c) a snail boat is moving due to wind energy d) a windmill is lifting water from a well
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When a donkey is carrying a load on his back, it is applying a force in the upward direction. ... So, angle between force and displacement is 90 degrees. Hence, no work is done. (c) A wind-mill is lifting water from a well
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A is your answer
Explanation:
Donkey is not doing any work in carrying the load as weight (acting vertically downward) and displacement (acting horizontal) are perpendicular to each other. But, it does work against friction between its hoofs and the ground
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