1. The problem statement, all variables and given/known data A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.71 of the person's regular weight. Calculate the magnitude of the acceleration of the elevator. 2. Relevant equations FN=mg+ma 3. The attempt at a solution With the way the problem is worded, I'm assuming that the elevator is going down, which could mean that the equation should be FN=mg-ma? Other than assuming that I really have no idea how to start this problem.