Question

state work energy theorem and prove it for variable force​

Answer 1

Answer:

work done by a body = change in it's kinetic energy

Answer 2

Answer:

Work energy theorem -

it states that the work done by the net force acting on a body is equal to the changed produced in kinetic energy of the body.

Proof-

we use equation of motion

v square - u square =2as

multiplying both sides by m/2

we get

mv square /2 + mu square/2 = mas

by Newton second law

F=ma

now

mv square /2 -mu square/2 = Fs =W

then it can be written as

Kf - Ki = W

this is the proof of work energy theorem.......

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