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Ocean waves move toward a sea shore. The waves are regularly spaced. On their way to the shore, they pass a buoy and a dock. From the dock, a student wants to determine the speed of the waves.

Which of the following would be useful in determining the speed of the waves?

Select TWO answers.


A vertical scale on the side of the dock and partially submerged typically used to measure the height of tides.


The buoy, which is straight out from the dock, and has a sign on it that reads, “100 feet from the dock. No swimming beyond this point.”


A nearby clock tower with visible hour, minute, and second hands.


A sign which tells when high tides and low tides will be.

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