A 58.0 kg girl weighs herself by standing on a scale in an elevator.
a. What is the force exerted with the scale when the elevator is descending at a constant speed of 10 m/s?
b. What is the force exerted with the scale if the elevator is accelerating downward with an acceleration of 2.0 m/s2?
c. If the elevator's descending speed is gauged at 10 m/s at a given point, however its speed is decreasing by 2.0 m/s2, what is the force exerted by the scale?