Answer:
the first one is Primary
the second one I think it's Mature but I don't know
Resistance = (voltage) / (current)
Resistance = (6.0 v) / (2.0 A)
Resistance = 3.0 ohms
60 RPM equals one hertz (i.e., one revolution per second, or a period of one second). The SI unit for period is the second.
Potential energy decreases and kinetic energy increases.
Potential energy is related to the height, since the wagon is going downhill, height decreases and potential energy decreases.
Kinetic energy is related to the speed, since the wagon is speeding up, kinetic energy increases.