May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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17Energy Work Power EfficiencyMedium1 mark
An object of weight 3.0 N is moved vertically at a constant velocity v by an electric motor. The electric motor has an efficiency of 25%. The object travels a vertical distance of 1.2 m in 3.0 s. Assume that the useful output energy of the motor is equal to the increase in gravitational potential energy of the object. What is the electric power supplied to the motor?