The question reads "A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only .75 of the person's regular weight. Calculate the acceleration of the elevator, and the direction." I know that the direction is going down because..it just seems like common sense, and I know the answer is 2.5m/s^2, but I don't understand how that was reached...any help? Thank you.