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A man lifted and put a box on the roof of the bus at a height h from Earth.

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A man lifted and put a box on the roof of the bus at a height h from Earth. What is the total work done on the box by the man and the gravitational field?

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Zero,
The work done by the man on the box,
W1 = mgh
and the work done on the bo× by gravitational field,
W2 = -mgh
∴ Total work done on the box,
W = W1 + W2 = mgh – mgh = 0
or W = 0 (zero)

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