Question

The UPS guy is delivering two rectangular boxes to the 4th floor. The boxes are stacked vertically in the elevator. The one on the bottom has a mass of 5.00 kg and the one on the top has a mass of 2.00 kg. The elevator, the UPS guy, and both boxes are accelerating upward at 2.50 m/s². What is the magnitude of the normal force between the two boxes? For the physical representation (part 2a), draw and label an appropriate free-body diagram. For both the physical representation (part 2a) and the solution (part 3a), indicate specifically if the system being analyzed is the top box by itself, the bottom box by itself, or the combination of the two boxes taken as a single object.

Answer 1

Libt a. 'T 2 C3 5 t9 M q nat S0 N-mg = ma