A basketball of 0.400 kg is drop of a height of 5.00 m to the ground and bounce back to a height of 3.00 m a. On its way down,how much potential energy does the ball lose? b. On its way back,how much potential energy does the ball regain?

1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?

5. A 0.085kg toy popper, the plastic kind made from a spring and a suction cup, is compressed 0.03m towards the tabletop. It releases and "pops" up to a maximum height of 0.35m above the tabletop. a. What is the potential energy at its highest point? b. What was the kinetic energy when it left the tabletop? c. How fast was it moving when it left the tabletop? d. How much elastic potential energy was in the popper spring when it was compressed? e. What is the spring constant of the spring in the popper?

A 150 g baseball is thrown straight up.  If it is released at a height of 1.0 m above the ground with a kinetic energy of 2.4 J, what is its height above the ground when its kinetic is 1.2 J?  cc