An experimental fireworks shell is launched vertically from point A with an init

Question

An experimental fireworks shell is launched vertically from pointAwith an initial velocity of magnitudev0= 140 ft/sec. In addition to the acceleration due to gravity, an internal thrusting mechanism causes a constant acceleration component of 3.0gin the direction shown for the first 3.0 seconds of flight, after which the thruster ceases to function. Determine the maximum heighthachieved, the total flight timet, the net horizontal displacementxfrom pointA, and plot the entire trajectory. Neglect any acceleration due to aerodynamics.

my problem is 51 degrees not 60 degrees and component of 3.0g not 2g as shown in the figure.

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