A2.00 kg block hangs from a spring balance calibrated in newtons that is attached to the ceiling of an elevator. (a) what does the balance read when the elevator is ascending with a constant speed of 34 m/s? (b) what does the balance read when the elevator is descending with a constant speed of 27 m/s? (c) what does the balance read when the elevator is ascending at 33 m/s and gaining speed at a rate of 9 m/s^2? (d) suppose that from t = 0 to t = 4.6 s, the elevator ascends at a constant speed of 10 m/s. its speed is then steadily reduced to zero during the next 3.5 s, so that it is at rest at t = 8.1 s. describe the reading of the scale during the interval 0 < t < 8.1 s.