Physicshard · Past Paper
A car is moving with velocity V. If the brakes provide a retardation 'a', the time required to stop is:
AV/a
BV^2/2a
Ca/V
DVa
✓ Correct Answer: A — V/a
From v = u + at, where v=0 and u=V, then 0 = V - at, so t = V/a.
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