Example (3-7): In a block-spring system, m = 0.2 kg and k = spring has a compression of 6 cm and the block has a velocity v = (a) What is the displacement as a function of time? (b) What is the first time (>0) at which the velocity is positive and 60% of its maximum 5N/m. At t = 7/10 s, the %3D = -40 cm/s.

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