What is the work done by gravitational force in taking the mass m with constant velocity through height h?
Work done by gravitaional force, F = mgh.
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Does the body at rest possess energy?
A body at rest possess potential energy.
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By eating two apples, a person starts pushing the wall of room. If food value of apple is 100 calories per apple, how much work he will do in pushing the wall in one hour?
Zero, because the displacement of the wall will be zero.