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6. A projectile is fired from ground level, and 10 seconds later hits a target 374 m away and 45 m above the ground. What were the initial velocity and launch angle? 7. The horizontal velocity of a projectile is assumed constant, vx vo cos Bo. The vertical velocity of the ball can be written as a function of time, vy(t)- vo sin 8o + ayt, where the acceleration ay in the y-direction is assumed constant. a. Set the origin of the coordinate system at the initial position, and use the methods of calculus to write the vector position of the ball as a function of time, (t) x(t)i + y(t)j. b. Find the magnitude and direction of the vector positon of the ball as functions of time, r() and o.(o.

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