A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 180 m. (a) What can you say about the motion of the rocket after its engines stop? This answer has not been graded yet. (b) What is the maximum height reached by the rocket? 390.0 Correct: Your answer is correct. m (c) How long after liftoff does the rocket reach its maximum height? 8.55 Incorrect: Your answer is incorrect. Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. s (d) How long is the rocket in the air? 23.6 Incorrect: Your answer is incorrect. Your response differs from the correct answer by more than 10%. Double check your calculations. s