A 500 kg elevator carries 6 adults 75 kg cach. The elevator starts at rest at the ground floor and reaches it cruising speed of 20 m/s at the 30th floor that is 100m above the ground floor. Use only energy methods to determine the following physical quantities: a. The change in kinetic energy of the elevator from the ground to the 30th floor. b. The work done by the force of tension of the elevator. c. The Force of Tension on the elevator. d. The power output of the motor lifting the elevator.