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A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the gravitational force?

A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the gravitational force? How much work is done by the external force? How much work is done by the gravitational force , if the mass is returned back to the ground level?

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