In which of the following case(s), no work is done by the force? (1) A man carrying a bucket of ...

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In which of the following case(s), no work is done by the force?
(1) A man carrying a bucket of water, walking on a level road with a uniform velocity.
(2) A drop of rain falling vertically with a constant velocity.
(3) A man whirling a stone tied to a string in a circle with a constant speed.
(4) A man walking upon a staircase.
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