Question

Question #0c378

Answer 1

Double

Explanation:

400% = 4, meaning the KE has increased 4 folds.

Let `K_1= 1/2mv^2`

If you double the velocity, `v->2v`, then
`K = 1/2m(2v)^2=4 (1/2mv^2) = 4K_1`

Therefore the velocity has doubled.

KE increased by 9X if the velocity is tripled, 16X if quadrupled and so on...