Question

PLEASE HELP!!!!!!!!!!

An object's velocity increases, multiplied by a factor of 9. What factor would its Kinetic Energy increase by?

Answer 1

by a factor of 4

Step-by-step explanation:

The kinetic energy is proportional to the square of the speed so doubling the speed increases.

Answer 2

by 81

Step-by-step explanation:

KE = (1/2)mv^2. If v2 ---> 9v then

KE2 = (1/2)m(9v)^2 = 81[(1/2)mv^2]

= 81 KE