The 13.3-in. spring is compressed to a 8.0-in. length, where it is released from rest and accelerates the sliding block A. The acceleration has an initial value of 500 ft/sec and then decreases linearly with the x-movement of the block, reaching zero when the spring regains its original 13.3-in. length. Calculate the time t for the block to go (a) 2.65 in. and (b) 5.3 in. 8.0" A -13.3" wwww