(Answered) A mass on a spring vibrates in simple harmonic motion at a

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A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 4.0 cm. If a timer is started when its displacement is a maximum (hence x =4cm when t=0), what is the acceleration magnitude when t= 3 s? What is the speed of the mass when t= 3 s?

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