2. As a student lifts a 4.5-kg book bag 120 cm into the air, the amount of work that the force of gravity does o the bag is a 5.4 J d. -5.4J 53 J e. -53 J c. 540 J A B C E D 3. A race is set up with five balls placed at the top of the five ramps shown below and released at the same instant. Each ramp drops the same vertical height. That ramp that will allow the ball to arrive at the bottom last is a. A d. D b. B e. E C . C 4. A 5.0-kg cat travelling at 1.3 m/s [E] has a momentum of a. 6.5 m/s [E] d. 3.8 m/s [W] b. 6.5 m/s [W] e. none of the above c. 3.8 m/s [E]