12-117. Starting from rest, the motorboat travels around the circular path, p = 50 m, at a speed v (0.8t) m/s, where t is in seconds. Determine the magnitudes of the boat's velocity and acceleration when it has traveled 20 m. = 12-118. Starting from rest, the motorboat travels around the circular path, p = 50 m, at a speed v = (0.2t) m/s, where t is in seconds. Determine the magnitudes of the boat's velocity and acceleration at the instant t=3 s