physics
posted by jim .
A model rocket is launched straight upward with an initial speed of 60.0 m/s. It accelerates with a constant upward acceleration of 2.00 m/s2 until its engines stop at an altitude of 130 m.
(a) What is the maximum height reached by the rocket?
Your response differs from the correct answer by more than 10%. Double check your calculations. m
(b) How long after liftoff does the rocket reach its maximum height?
s
(c) How long is the rocket in the air?
s

I will be happy to critique your calculations.