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{"ops":[{"insert":"A boat is lying alongside a jetty. The boat is bobbing up and down with simple harmonic motion which has a period of 5 s. The amplitude of the rise and fall is 0.6 m. At its highest point the boat is just level with the jetty. In order to comfortably step off the boat onto the jetty the difference in height needs to be no more than 0.3 m. For how long, in each cycle, is the boat within that range?\n"}]}
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