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Question

A force of magnitude 25 N acting on a body of mass 2 kg increases its kinetic energy from 100 J to 200 J. The displacement of the body during this interval is ___m.


Solution

According to work-energy theorem, work done by the force would be equal to the change in kinetic energy of the body. The change in kinetic energy is equal to 100 J and we know that: 

Work done = Force×Displacement

Therefore, 100 = 25×Displacement

. So, from here we have displacement = 4 m.

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