Question

the mass of a body in m and its velocity is v, prove that its kinetic energy is 1/2 m v²​

Answer 1

Answer:

so lengthy derivation but see the short way

as we have

w=FS----1

F=ma

vi=0

Vf=v

2as=Vf² - Vi²

s= v²/2a

put value of F and s in eq 1

w = ma×v²/2a

w=K.E = 1/2 mv²