A cable lowers a 1350 kg elevator so that the elevator's speed increases from zero to 4.0 m/s in a vertical distance of 5.6 m.
A- What is the force that the cable exerts on the elevator while lowering it? (Assume that the system is the elevator and Earth.)
B- What is the force that the cable exerts on the elevator while lowering it? (Assume that the system is the elevator only.)