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Work, Energy and Power
Momentum is a vector quantity, therefore, though its magnitude remains constant, its direction changes, hence the momentum will change. After collision, the direction of motion and hence momentum changes, therefore, momentum of molecule will not remain conserved.
Since the speed of molecule remains constant, its kinetic energy remains conserved. Therefore collision is an example of elastic collision.
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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?
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