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A 2.5 kg particle is in simple harmonic motion in one dimension and moves according to the equation
x = (6.4 m)cos[(p/3 rad/s)t - p/4 rad].
(a) At what value of x is the potential energy of the particle equal to half the total energy?
(b) How long does it take the particle to move to this position x from the equilibrium position?
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