A 16-kg scooter is moving at a speed of 7 m/s. The scooter's speed doubles. What is the scooter's kinetic energy when its speed doubles?

a. 784 J

b. 1568 J

c. 392 J

d. 112 J

The formula for kinetic energy is:

KE = 0.5mv^2

where:

m = mass

v = speed

Given this formula, the original KE of the scooter is calculated as 392 J. Since the speed is doubled, it can be observed in the formula that the change would actually affect the kinetic energy by quadrupling it. This is because 2^2 is 4. So, 392 (4) = 1568 J or B.