Can you write the formula for kinetic energy ?
Here, let me help you:
Kinetic energy = (1/2) (mass) (speed)² .
Look at the (speed) in the formula. It's squared.
So if the speed gets multiplied by (something),
the kinetic energy gets multiplied by (something)² .
If the speed starts out at 1 m/s, but gets multiplied by 4,
then the kinetic energy gets multiplied by (4)² = 16 .