O-LevelPhysicsEnergy & Work5054/11 · May/June 2020 · Q161 Mark

In a weightlifting contest, an athlete lifts a metal bar of mass 20 kg fitted with a mass of 80 kg on each end. The lift from ground to a height of 2.5 m takes 0.50 s. The gravitational field strength g is 10 N/kg. What average power does the weightlifter exert in providing the gravitational potential energy during this lift?

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A0.90 kW

B5.0 kW

C8.0 kW

D9.0 kW

✓ Correct answer

D: 9.0 kW

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Topic: Energy & Work, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2020 Paper 1 Variant 1, question 16.

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