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

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An experimental fireworks shell is launched vertically from point A with an initial velocity of magnitude v0= 140 ft/sec. In addition to the acceleration due to gravity, an internal thrusting mechanism causes a constant acceleration component of 3.0g in the direction shown for the first 3.0 seconds of flight, after which the thruster ceases to function. Determine the maximum heighth achieved, the total flight time t, the net horizontal displacement x from point A, 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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