An elevator in a tall building is fitted with a counterweight. The total mass of the car and passengers is 668 kg. The counterweight has mass 512 kg. A motor lifts
the elevator car through a distance of 16.2 m in 15.0 s. The efficiency of the motor is 24.0%. Calculate
the total input of electrical power to the motor
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Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.