A mass on a spring vibrates in simple harmonic motion at a frequency of 4.2 Hz and an amplitude of 4.2 cm.If a timer is started when its displacement is a maximum (hence x = 4.2 cm when t = 0) ,what is the acceleration magnitude when t = 4 s?

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The Answer of A mass on a spring vibrates in simple harmonic motion at a frequency of 4.2 Hz and an amplitude of 4.2 cm.If a timer is started when its displacement is a maximum (hence x = 4.2 cm when t = 0),what is the acceleration magnitude when t = 4 s? A) zero B) 0.3 m/s² C) 18.1 m/s² D) 9 m/s² E) 11.8 m/s²

A Mass on a Spring Vibrates in Simple Harmonic Motion