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Civil Engineering

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The 13.9-in. spring is compressed to a 7.7-in. length, where it is released from rest and accelerates the sliding block A. The acceleration has an initial value of 190 ft/sec2 and then decreases linearly with the x-movement of the block, reaching zero when the spring regains its original 13.9-in. length. Calculate the time t for the block to go (a) 3.1 in. and (b) 6.2 in.