Problem 3. (8 points) A man stands on a weighing scale in an ascending elevator. The elevator speeds up when it starts, then moves with a constant speed, and nally slows down when it reaches its destination oor. Assume that the magnitude of the acceleration is the same while speeding up and slowing down. The scale reads 60 kg when the elevator is speeding up and 40 kg when it is slowing down. (a) Draw the freebody diagram for the man (b) What is the man's mass? ((2) What is the magnitude of the acceleration