Physicshard · Past Paper
A train starts from station A with acceleration 0.5 m/s^2 and then retards at 1 m/s^2 to stop at station B. If total time is 30s, distance AB is:
A150 m
B225 m
C300 m
D450 m
✓ Correct Answer: A — 150 m
Using the formula S = 0.5 * (a1*a2 / (a1+a2)) * T^2 = 0.5 * (0.5 * 1 / 1.5) * 30^2 = 0.5 * (1/3) * 900 = 150m.
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