Physicsmedium · Past Paper
An athlete runs on a circular track of radius R. What is his distance and displacement after 1.5 rounds?
A3*pi*R, 2R
B2*pi*R, R
Cpi*R, 2R
D3*pi*R, zero
✓ Correct Answer: A — 3*pi*R, 2R
Distance = 1.5 * circumference = 1.5 * 2*pi*R = 3*pi*R. After 1.5 rounds, he is at the opposite end of the diameter, so displacement = 2R.
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