A-LevelPhysicsWork, energy and power9702/12 · May/June 2017 · Q161 Mark

A stone of mass m falls from rest at the top of a cliff of height h into the sea below. Just before hitting the sea the stone has speed v. What is the average force of air resistance acting on the stone during its fall?

Amg

Bm(v² – 2gh) / h

Cmg – mv² / 2h

Dmgh – mv² / 2

✓ Correct answer

C: mg – mv² / 2h

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2017 Paper 1 Variant 2, question 16.

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