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{"ops":[{"insert":"A submarine trying to detect an enemy destroyer notes that a sonar signal sent through the water returns 0.40 seconds after it was sent.\u00a0The frequency of the sonar used by the submarine is 20 kilo-hertz. The speed of sound in sea water is 1.56 x 10"},{"attributes":{"script":"super"},"insert":"3"},{"insert":" meters per second.\u00a0\n\ne.\u00a0How far away is the destroyer?\u00a0\n\nf. The sonar computers receive a reflection from the destroyer at a frequency of 19 kilo-hertz.\u00a0What useful information about the motion of the destroyer does this mean the computer can report?\u00a0\n"}]}
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