Question

if the velocity of an object is increased four times then what effect of k. E

Answer 1

k.e. will increase more than 4 times of k.e.
since, k.e. = 1/2 m v ^2

Answer 2

initial (k.E)= E=1/2mv^2
initial velocity=v(let)
final velocity= 4v
so, k.E.= 1/2m(4v)^2
=16k.E.

so, final k.E. is 16 times the initial k.E.