Ultrasonics sent by a SONAR return back to it after reflection from...

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Ultrasonics sent by a SONAR return back to it after reflection from a rock under water after a time lapse of \( 2 \cdot 2 \mathrm{~s} \). If the velocity of ultrasonics in water is 1,450 \( \mathrm{m} \mathrm{s}^{-1} \), find the depth of the rock below the water surface.
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