a baseball bat exerts a force of magnitude f on a ball. if the mass of the bat is three times the mass of the ball, the magnitude of the force of the ball on the bat is

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?