A person burned a firecracker in front of a cliff and heard its echo 5 s after it burst. The distance of the cliff from the person, if the speed of the sound is 340 m/s, is close to
The total distance traveled by sound is speed × time = 340 m/s × 5 s = 1700 m. Since the echo takes 5 s for the round trip, the distance to the cliff is 1700 m / 2 = 850 m round trip, making it 1700 m both ways.