A 2000 kg roller coaster car follows the track drawn below: a. At the top of the hill, what is the potential energy of the roller coaster assuming v = om/s?
b. What is the speed of the roller coaster at the bottom of the hill? Assume h=om.
c. What is the speed at the top of the hill, where h = 20 m?​

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

What is the scientific definition of energy that relates to work

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.