Kinetic energy is greatest when a roller coaster
1) is at the top of a hill.
2) is at the bottom of a hill.
3) has not yet started moving.
4) has just left the bottom of a hill.
provide an explanation. you!

1. what is the si unit of emf? 2.a complete series circuit consists of a 12.0 v battery, a 4.70 ω resistor, and a switch in the closed position. the internal resistance of the battery is 0.30 ω. what does an ideal voltmeter read when placed across the resistor?