State work-energy theoram.prove it for variable force
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✔✔ Work energy theorem states that the change in kinetic energy of an object is equal to the net work done on it by the net force. Hence, work done on a body by a force is equal to the change in its kinetic energy .
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theorem
it states that work done by a force acting on a body is equal to the change in kinetic energy of the body
prove
we know v^2 - u^2 = 2.a.s ..........(1)
multiply each term of eqn (1) by m/2
1/2 mv^2 = final k.e
1/2 mu^2 = initial k.e
k.e f- k.e i =mas
ma=f
k.e f - k.e i = f.s
W = K.E F - K.E I
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