A car has a kinetic energy of 1.9 x 10^3 joules. If the velocity of the car is decreased by half, what is the kinetic energy

A.) 2.2 x 10^2 joules

B.) 4.7 x 10^2 joules

C.) 5.2 x 10^2 joules

D.) 5.8 x 10^3 joules

Kinetic energy is given by 1/2 MV²

k. e = 1/2 mv²

1.9 * 10^3 = 1/2m (v/2) ²

1.9 * 10^3 = 1/8 mv²

1.9 * 10^3 = 1/4 (1/2mv²)

= (1.9 * 10^3) / 4

= 4.75 * 10^2 joules

The new kinetic energy will therefore be 4.7 * 10^2 joules.