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An orange falls from a height of 20m. How long does it take to reach the ground?


Question

An orange falls from a height of 20m. How long does it take to reach the ground?

Options

A) 2.0 sec

B) 0.5 sec

C) 1 sec

D) 4 sec

The correct answer is D.

Explanation:

\(s = ut + \frac{1}{2}gt^2\)
s = 20m, u = 0, t = ?
g = 10m/s\(^2\)
20 = 5t\(^2\)
t\(^2\) = \cfrac{20}{5} = 4
t\(^2\) = 4
t = \(\sqrt{4}\)
t = 2secs

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