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A spring is stretched a distance of Dx = 40 cm beyond its relaxed length. Attached to the end of the spring is an block of mass m = 12 kg, which rests on a horizontal frictionless surface. A force of magnitude 20 N is required to hold the block at this position. The force is then removed.
a) When the spring again returns to its unstretched length, what is the speed of the attached object?
b) When the spring has returned only halfway (20 cm), what is the speed of the attached object?
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