is the race ceed ature speed is increased by v = (0.051²) ft/s², where t is in seconds, determine the magnitudes of its velocity and acceleration when = 18s. *12-116. The automobile is originally at rest s = 0. If it then starts to increase its speed at i = (0.051²) ft/s², where t is in seconds, determine the magnitudes of its velocity and acceleration at s = 550 ft. 300 ft t then 80 ft at ane the by r = and the 240 ft 12-117. Probs. 12-115/116 The two cars A and B travel along the circular path at constant speeds = 80 11/s and = 100 /s