Physicshard · Past Paper
A stone is dropped from a height. If it covers the last 44.1m in the last second, find the total time of fall. (g=9.8 m/s^2)
A4 s
B5 s
C6 s
D3 s
✓ Correct Answer: B — 5 s
Sn = g/2(2n-1) => 44.1 = 4.9(2n-1) => 9 = 2n-1 => 2n=10 => n=5s.
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