Astudent, standing on a scale in an elevator at rest, sees that his weight is 840 n. as the elevator rises, his weight increases to 1050 n, then returns to normal. when the elevator slows to a stop at the 10th floor, his weight drops to 588 n, then returns to normal. draw force diagrams for the student during beginning and end of his elevator ride. determine the acceleration at the beginning and end of the trip.