Question

Speed of a body in motion is doubled. It kinetic energy is now ______ times the original kinetic energy.
(A) two
(B) three
(C) four
(D) one half

Answer 1

four is the ans. I do not know the reason for this but surely the ans. is four

Answer 2

Kinetic energy would be 4 times the original K.E, if the speed is doubled.