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A 550 N physics student stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 450N.

A 550 N physics student stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 450N. (a) Find the acceleration of the elevator (magnitude and direction) (b) What is the acceleration if the scale reads 670 N? (c) If the scale reads zero, should the student worry? Explain.

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