A 2.0-kg block hangs from a spring scale calibrated in

Chapter , Problem 65

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A 2.0-kg block hangs from a spring scale calibrated in newtons that is attached to the ceiling of an elevator (Figure 4-49). What does the scale read when (a) the elevator is ascending with a constant speed of 30 m/s; (b) the elevator is descending with a constant speed of 30 m/s; (c) the elevator is ascending at 20 m/s and gaining speed at a rate of (d) Suppose that from to the elevator ascends at a constant speed of 10 m/s. Its speed is then steadily reduced to zero during the next 4.0 s, so that it is at rest at Describe the reading of the scale during the interval 0 t 9.0 s. t _ 9.0 s. t _ 5.0 s, 3.0 m>s2? t _ 0 SSM