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In which of the following situations is no work being done by the object exerting the force?


An elevator floor is exerting a force perpendicular to the bottom of a man's shoes while the man is moving up.


A person is applying a normal force to a box to push it along a horizontal surface at a constant speed.


A person is holding a string that is exerting a force on a ball attached to the other end. The ball is moving in a circular path.


A person is slowly lowering a brick to the floor.


More than one of the preceding answers is correct.

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