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A 3.00-kg object is fastened to a light spring, with the intervening cord passing over a pulley. The pulley is frictionless, and its inertia may be neglected. The object is released from rest when the spring is unstretched. (a) If the object drops 15.0 cm before stopping, find the spring constant of the spring. N/m (b) If the object drops 15.0 cm before stopping, find the speed of the object when it is 5.10 cm below its starting point. m/s

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