Question

state and prove work -energy theorem for a variable force ?

Answer 1

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.......
I HOPE THIS WILL HELP YOU.

Answer 2

Answer:

work energy theorem for a variable force