PHYSICS HW HELP PLEASE. projectile motions?

i have been working forever on this problem... A rocket is launched at an angle 41 degrees above the horizontal with an initial speed of 65 m/s. it moves for 4 s along its initial line of motion with an acceleration of 25 m/s^2. at this time its engines fail and the rocket proceeds to move as a projectile. the acceleration of gravity is 9.8 m/s^2. find the max altitude reached by the rocket.