Starting at rest, a hydroplane accelerates at a = 0.8t for the first 10 seconds and then accelerates at a = -1.2t + 20 until it comes to a stop. The acceleration is show on the graph below. a (m/s^2) 8 10 a) How many seconds does the hydroplane travel before coming to a rest? 27 b) What is the maximum velocity in that the hydroplane reached? m S t (sec) c) How many seconds did it take the hydroplane to reach its maximum velocity? d) How many meters did the hydroplane travel?