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A coolie, with a load of 30kg on his head, walks on the platform. If he walks a distance of 60m, what is the work done by him?

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A coolie, with a load of 30kg on his head, walks on the platform. If he walks a distance of 60m, what is the work done by him?

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The work done by the coolie is zero because there is no displacement of’ the load in the direction of force, which he is applying vertically upwards. 

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