Question

what change should be affected in the velocity of the body to maintain same kinetic energy of its mass is increased four times?

Answer 1

KE=mv²/2

new KE=4mv²/2

            =2mv²

to maintain the original energy; velocity should be HALVED

then the new kinetic energy will become,

(2mv²)/2²

=mv²/2

which is the original KE