Physicsmedium · Past Paper
A stone is dropped from a height of 20m. How long does it take to reach the ground? (g=10 m/s^2)
A1 s
B2 s
C4 s
D20 s
✓ Correct Answer: B — 2 s
s = 1/2 gt^2 => 20 = 5t^2 => t^2 = 4 => t = 2s.
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