You are skateboarding on top of a small hill and take a break. You have 100 j of potential energy. If your mass is 80 kg, how high is the hill you are skating on?.

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?