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A car starts from rest and covers 100m in 5s. What is its acceleration?

A4 m/s^2
B8 m/s^2
C20 m/s^2
D40 m/s^2

✓ Correct Answer: B — 8 m/s^2

s = 0.5at^2 => 100 = 0.5 * a * 25 => a = 200/25 = 8 m/s^2.

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