Problem 4E

a. What is the kinetic energy of a 1500 kg car traveling at a speed of 30 m/s (≈ 65 mph)?

b. From what height would the car have to be dropped to have this same amount of kinetic energy just before impact?

c. Does your answer to part b depend on the car’s mass?

Solution 4E

Part (a)

Step 1 of 4:

Our aim is to find the kinetic energy of the car traveling at the speed given.

The mass of the car m = 1500 kg

The speed v = 30 m/s

The kinetic energy is given by

The kinetic energy of the car is 675 kJ.

Part (b)