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28. The displacement of an object attached to the end of a spring can be modelled by the function h(t) = 2.4 cos 12:+ 7

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28. The displacement of an object attached to the end of a spring can be modelled by the function h(t) = 2.4 cos 12:+ 7 , where h is the height of the object from the floor, in centimetres, and t is the time, in seconds. Determine the acceleration of the object at time t

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