3. If a 1.00 x 10² kW motor has an efficiency of 82%, how long will it take to lift a 50.0 kg object
to a height of 8.00 m?


4. A 2.00 kg object is accelerated uniformly from rest to 3.00 m/s while moving 1.5 m across a
level frictionless surface. Calculate the power output.