A model rocket is launched straight upward with an initial speed of 30.0 m/s. It accelerates with a constant upward acceleration of 2.50 m/s2 until...

A model rocket is launched straight upward with an initial speed of 30.0 m/s. It accelerates with a constant upward acceleration of 2.50 m/s2 until its engines stop at an altitude of 170 m.(a) What is the maximum height reached by the rocket? m(b) How long after lift-off does the rocket reach its maximum height? s(c) How long is the rocket in the air?