INSTRUCTIONS: Solve the following. Show your solutions in the answer sheet.
1. A roller coaster car reaches a maximum height of 45 m before moving downward. What is the speed of
the car at the lowest point of the track? If the kinetic energy of the car at its lowest point is 6.25 x 105 J,
what is the mass of the car?
2. A ball is dropped from the rest at the top of a building. It reaches the bottom of the building after 15
seconds. What is the speed of the ball before it hits the ground?​