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The motion of a particle connected to a spring is described by x = 0.4 cos...

The motion of a particle connected to a spring is described by x = 0.4 cos (pi t) (in meter).
a) What is its angular frequency and amplitude (maximum elongation) xmax?
b) What is its speed and acceleration at t = 0.167s?
c) At what time is the potential energy equal to the kinetic energy?

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