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3. A 230.0 g object on a spring oscillates on a frictionless horizontal surface with frequency 2.00 Hz
and amplitude 8.0 cm. Its position of time is given by x = Asin(wt) . A sketch a graph of the
elastic potential energy as a function of time. (b) Graph the system's kinetic energy and potential
energy as a function of time. (c) Describe qualitatively how your answers would change if the
surface weren't frictionless.[6]

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