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Simple Harmonic motion question

The height of the water on a beach can be approximated as simple harmonic motion with a period of 12hours If the mean water height is 3.5m, the amplitude of the tide is 1.6m, and `high water' occurs at 7am one day, what would you predict the height of the water to be at 11am?

Please help i have spent so long on this question.
i used equation x=Acos(w)tx=Acos(w)t
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Original post by joyoustele
The height of the water on a beach can be approximated as simple harmonic motion with a period of 12hours If the mean water height is 3.5m, the amplitude of the tide is 1.6m, and `high water' occurs at 7am one day, what would you predict the height of the water to be at 11am?

Please help i have spent so long on this question.
i used equation x=Acos(w)tx=Acos(w)t



https://uk.answers.yahoo.com/question/index?qid=20160716072259AAAqaeF

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