By how much will

Kinetic energy of a body depends on its mass and its speed.

KE = (1/2) mv²

Where, m = mass of the body

v = speed/velocity of the body

If the velocity has become twice of the previous value and since we can't change the mass of a body it’s an inherited property of a body.

Since, Kinetic energy = (1/2) mv² so in case we see the result in respect of the Kinetic energy of the body which, for twice velocity we can easily conclude its KE must have increased by 300% and becomes four times the previous value.