Question: The pendulum on a grandfather clock moves with simple harmonic motion, according to the equation y=8cos0.81t, where y is in centimetres and t is in

The pendulum on a grandfather clock moves with simple harmonic motion, according to the equation y=8cos0.81t, where y is in centimetres and t is in seconds. Find the displacement when t = 21 s. Your calculator must be set to radians.

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