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

Question

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.

Explanation / Answer

PLEASE RATE ME AND AWARD ME KARMA POINTS IF IT IS HELPFUL FOR YOU Projectile motion is a form of motion where a particle (called a projectile) is thrown obliquely near the earth's surface, & it moves along a curved path under the action of gravity. The path followed by a projectile motion is called its trajectory. Projectile motion only occurs when there is one force applied at the beginning of the trajectory after which there is no interference apart from gravity. Contents [show] [edit]The initial velocity If the projectile is launched with an initial velocity v0, then it can be written as . The components v0x and v0y can be found if the angle, ? is known: , . If the projectile's range, launch angle, and drop height are known, launch velocity can be found by . The launch angle is usually expressed by the symbol theta, but often the symbol alpha is used. [edit]Kinematic quantities of projectile motion In projectile motion, the horizontal motion and the vertical motion are independent of each other; that is, neither motion affects the other. [edit]Acceleration Since there is no acceleration in the horizontal direction velocity in horizontal direction is constant which is equal to ucosa. The vertical motion of the projectile is the motion of a particle during its free fall. Here the acceleration is constant, equal to g.[1] The components of the acceleration: , . [edit]Velocity The horizontal component of the velocity remains unchanged throughout the motion. The vertical component of the velocity increases linearly, because the acceleration is constant. At any time t, the components of the velocity: , . The magnitude of the velocity (under the Pythagorean theorem): . [edit]Displacement Displacement and coordinates of parabolic throwing At any time t, the projectile's horizontal and vertical displacement: , . The magnitude of the displacement: . [edit]Parabolic trajectory Consider the equations, , . If we eliminate t between these two equations we will obtain the following: , This equation is the equation of a parabola. Since g, a, and v0 are constants, the above equation is of the form , in which a and b are constants. This is the equation of a parabola, so the path is parabolic. The axis of the parabola is vertical. [edit]The maximum height of projectile Maximum height of projectile The highest height which the object will reach is known as the peak of the object's motion. The increase of the height will last, until , that is, . Time to reach the maximum height: . From the vertical displacement the maximum height of projectile: . [edit]Additional Equation For the relation between the distance traveled, the maximum height and angle of launch, the equation below has been developed.

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