Mrs. Wilson is driving her car to the store. She drives on a street where the speed limit is 50 mph. Then she turns onto a street where the speed limit is 45 mph. What happens to the kinetic energy of her car?

a
When she slows from 50 mph to 45 mph, the car’s kinetic energy increases.
b
When she speeds up from 45 mph to 50 mph, the car’s kinetic energy is changed to potential energy.
c
When she slows from 50 mph to 45 mph, the car’s kinetic energy stays the same.
d
When she slows from 45 mph to 50 mph, the car’s kinetic energy decreases.

d. When she slows from 45 mph to 50 mph, the car’s kinetic energy decreases.