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A ship sends out ultrasound that returns...

A ship sends out ultrasound that returns form the seabed and is detected after `3.42 s`. If the speed of the ultrasound through sea water is `1531 m//s`, what is the distance of the seabed from the ship ?

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The correct Answer is:
2.618 km
`d = (vt)/(2) = ((1531 m//s) xx (3.42 s))/(2) = 2618 m = 2.618 km`.
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