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Question 15) An elevator motor is moving an empty elevator upwards at a speed of 5.0
mis, as shown below. The power input to the motor is 4.0 kW. The motor is 7U 5
efficient

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Question 15) An elevator motor is moving an empty elevator upwards at a speed of s.0 m/s, as shown below. The power input to the motor is 4.0 kW. The motor is 707% efficient. Empty elevator of mass m To Counter-balance 'of mass m What is the magnitude of the force (friction plus air resistance) against which the motor is working?