If a box is kept on a smooth inclined plane, at what angle of inclination does the gravitational force does zero work?
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(i) No. As the surface is smooth and the friction is zero, work done by the force will only depend on the force and the displacement.
(ii) No, because gravitational force is a conservative force and work done by a conservative force will depend only on the force and the displacement.
Angle 90°
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