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A 60 kg girl weighs herself by standing on a scale

A 60-kg girl weighs herself by standing on a scale in an elevator. What does the scale read when?

(a) The elevator is descending at a constant rate of 10 m/s;

(b) The elevator is descending at 10 m/s and gaining speed at a rate of 2 m/s2;

(c) The elevator is ascending at 10 m/s but its speed is decreasing by 2 m/s in each second?

(a) The elevator is descending at a constant rate of 10 m/s;

(b) The elevator is descending at 10 m/s and gaining speed at a rate of 2 m/s2;

(c) The elevator is ascending at 10 m/s but its speed is decreasing by 2 m/s in each second?

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