2. (a) A 72.3 kg man carrying a 5.23 kg box gets on an elevator. As the elevator accelerates upwards at 0.224 m/s^2, he feels the box is heavier. How much force does it exert on his arms during acceleration?
(b) During this time, what is the weight on the floor from his feet?
(c) Later he gets on and goes down. His acceleration is 0.195 m/s^2, what is the weight on the floor from his feet during this time?