One kind of elevator has the elevator car hanging from a cable, which then passes over a pulley and connects to a counterweight, as shown in (figure 1). the mass of a fully-loaded elevator (that is, the elevator and all its passengers) is 1800 kg , the mass of the counterweight is 1700 kg , and the pulley has a radius of 0.4 m and a mass of 350 kg . a motor drives the motion of the elevator by exerting a torque on the pulley. assume that friction is negligibe. what is the magnitude of the torque the motor must exert in order to lift a fully-loaded elevator with a constant acceleration of magnitude 1.0m/s2? what is the magnitude of the torque the motor must exert in order to lower a fully-loaded elevator with a constant acceleration of magnitude 1.0m/s2? a group of people get on a fully-loaded elevator and ride it up three floors (a distance of about 9 meters), where they exit the elevator. if it took 5 seconds for the elevator to travel up those three floors, how much power did the motor need to provide?