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A 0.43 kg object connected to a light spring with a spring constant of 21.4 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest.
(a) Determine the maximum speed of the mass.
(b) Determine the speed of the mass when the spring is compressed 1.5 cm.
(c) Determine the speed of the mass when the spring is stretched 1.5 cm.
(d) For what value of x does the speed equal one-half the maximum speed?

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