Question

If the velocity of an object become double and mass become half then calculate change in k.E

Answer 1

Ki = 1/2 m v²

Kf = 1/4m (2v)² = mv²

Change in KE = Kf - Ki

                      = 1/2 m v²

Answer 2

hey mate
kinetic energy of a particle moving with velocity v and mass m is 1/2mv^2
so when v becomes 2v and m becomes 1/2m
then K.E becomes mv^2//
so change in K.E=kf-ki=(mv^2)/2
i hope u understood!!