Derive expression for kinetic energy of a body.
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Suppose a body of mass m is moving with velocity v. It is brought to rest by applying a retarding force F. Suppose it traverses a distance s before coming to rest. Kinetic energy of body, KE = Work done by retarding force to stop it.
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Suppose a body of mass m is moving with velocity v. It is brought to rest by applying a retarding force F. Suppose it traverses a distance s before coming to rest. Kinetic energy of body, KE = Work done by retarding force to stop it.
0= v²-2as
Distance ,s= v²/2a
Kinetic energy, KE= ma× v²/2a
= 1/2×mv²
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