A. 10ms‾¹
B. 15ms‾¹
C. 20ms‾¹
D. 30ms‾¹
Correct Answer: Option D
D. 30ms‾¹
Explanation
V² = U² + 2gh
= 0² + 2 x 10 x 45 = 30
![an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330ms-1]")
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