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A brick of mass m=0.49 kg is set against a spring with a spring constant of k1 = 639 N/m which has been compressed by a distance of 0.1 m. Some distance in front of it, along a frictionless surface, is another spring with a spring constant of k2 = 261 N/m. Part (a) How far, d2 in meters, will the second spring compress when the brick runs into it? Part (b) How fast, v in meters per second, will the brick...