When an object is allowed to slide down a hill it stops at the point b because of friction. If friction force depends only on the normal component of the reaction force with coefficient of friction variable along the path, the work done in taking the object slowly from b to a along the hill will be?
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When an object is allowed to slide down a hill it stops at the point b because of friction, the work done in taking the object slowly from b to a will be equal to the WEIGHT of the object.
• Since, the friction force depends only on the normal component of the reaction, the normal for is nothing but the weight of the body.
• Thus, when no other external factors act, the work done in taking the object slowly back to point will be equal to the weight of the body.
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