You are standing on a scale inside an elevator. The scale reads 13 less than your weight. What is the acceleration of the elevator?

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(1) Answers

Skyheart

Well, you must know your own mass.
Assuming that, you get [latex]G = m ( g + a) \\ G' = m g \\ G - G' = 13 \\ m ( g + a - g ) = 13 \\ a = \frac{13}{m}[/latex]
So, the acceleration is 13 divided by your own mass.