A-LevelPhysicsPhysical quantities and units9702/12 · Oct/Nov 2012 · Q71 Mark

The speed of a car is calculated from measurements of the distance travelled and the time taken. The distance is measured as 200m, with an uncertainty of ±2m. The time is measured as 10.0s, with an uncertainty of ±0.2s. What is the percentage uncertainty in the calculated speed?

A±0.5%

B±1%

C±2%

D±3%

✓ Correct answer

D: ±3%

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2012 Paper 1 Variant 2, question 7.

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