1. The problem statement, all variables and given/known data A 56.0 kg girl weighs herself by standing on a scale in an elevator. What is the force exerted by the scale when the elevator is descending at a constant speed of 10 m/s? What is the force exerted by the scale if the elevator is accelerating downward with an acceleration of 2.4 m/s2? If the elevator's descending speed is measured at 10 m/s at a given point, but its speed is decreasing by 2.4 m/s2, what is the force exerted by the scale? 2. Relevant equations Fnet=ma How do we find acceleration without having a time?