check my answer please :) SIMPLE HARMONIC MOTION -
Question: The rise and fall of the ride at the mouth of a river is assumed to be simple harmonic motion. The depth of water at low tide is 0.7m and the depth at high tide is 3.7m.
If low tide occurred at 8:55am and high tide at 3:05pm, find the earliest time at which the boat could enter the mouth of the river if it required the water to be at least 2m deep.
My solution: http://prntscr.com/7d1ex1

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ohhh okayyy!
Give me a minute or so to work it out :)

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