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I need help to solve this question about simple harmonic motion A 0.9 kg object performs a simple harmonic motion according to the following equation

I need help to solve this question about simple harmonic motion

A 0.9 kg object performs a simple harmonic motion according to the following equation r = 4cos (3t+=) where x is in meter and t is in second. At time t = 7 s, calculate the acceleration of the object. [4 marks]

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