A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.790 of the person's regular weight.

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This solution is provided in 277 words and is attached in both a .doc and .pdf file. It uses diagrams and equations to find the answer, including a discussion of fictitious force.

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... Boat's original direction. Newton's Laws of Motion: 1. Calculate the acceleration of a 82kg couch that is pushed across the floor with an unbalanced force of 21 ...

... elevator is (1.17) The elevator is going down, but the acceleration is in the opposite direction (the elevator slows down), hence the acceleration is positive. ...