I need help solving a physics problem. The question is a rocket is launched at an angle of 53o above the horizontal with an initial speed of 100 m/s. It moves for 3 s. along its initial line of motion with an acceleration of 30.0 m/s2. At this time its engines fail and the rocket proceeds to move as a projectile. Find (a) the max altitude reached by the rocket, (b) its total time of flight, and (c) its horizontal range. The answers in the back of the book have a being 1520, b being 36.1 and c being 4050. I have tried working on this problem for some time now and I get (a) being 435 so it doesnt allow me to find b and c. If someone could please help me out I'd really appreciate it. Thanks!