A-LevelPhysicsWork, energy and power9702/12 · May/June 2010 · Q161 Mark
A force of 1000 N is needed to lift the hook of a crane at a steady velocity. The crane is then used to lift a load of mass 1000 kg at a velocity of 0.50 m s⁻¹. How much of the power developed by the motor of the crane is used in lifting the hook and the load? Assume that the acceleration of free fall g is equal to 10 m s⁻².
A5.0 kW
B5.5 kW
C20 kW
D22 kW
✓ Correct answer
B: 5.5 kW
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