A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.80 of the person's regular weight. Calculate the acceleration of the elevator, and find the direction of acceleration.

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SOLUTION:

Since we have:

gravity x 0.80 + acceleration of elevator = gravity Hence, the acceleration of the elevator can be calculated by:

9.8 x (1 - 0.80) = 9.8 x 0.20 = 1.96 m/sec^2

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