alleryA boy shouts and hears his echo after 2 s. Sound travels at 343 m/s. How far is the cliff?
A686 m
B1.5 km
C171.5 m
D343 m
Answer & Solution
Correct answer: D. 343 m
In 2 s the sound covers 686 m going and returning, so the cliff is half of that, 343 m, away.
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