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A submarine that is not moving sends out a sonar sound wave travelling at 200 m/s, which reflects off a boat back to the submarine. The sonar crew detects the reflected wave 8 s after it was send out. how far away is the boat from the submarine?
$8000 m$
$80 m$
$800 m$
$9000 m$

A

9000 m

B

80 m

C

800 m

D

8000 m

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