12–115. The automobile is originally at rest at s = 0. If its speed is increased by i = (0.0512) ft/s², where t is in seconds, determine the magnitudes of its velocity and acceleration when t = 18 s. *12–116. The automobile is originally at rest s = 0. If it then starts to increase its speed at i = (0.051?) ft/s², where tis in seconds, determine the magnitudes of its velocity and acceleration at s = 550 ft. - 300 ft- 240 ft

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