2.9.seconds
2.8 seconds
2.6 seconds
1.4 seconds
Correct answer is A
s = \(\frac{1}{2}gt^2\)
40 = \(\frac{1}{2} \times 9.8 \times t^2\)
\(\frac{80}{9.8} = t^2\)
t = \(\sqrt{8.16326}\)
t ≈ 2.9 secs
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