Physicshard · Past Paper
The stopping distance of a car is 40 m when moving at 20 m/s. If the same car moves at 40 m/s, the stopping distance is:
A80 m
B120 m
C160 m
D200 m
✓ Correct Answer: C — 160 m
Stopping distance is proportional to v^2. If v doubles, distance becomes 2^2 = 4 times. 40 * 4 = 160 m.
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