Problem 19: A football is punted from the ground, it passes through the apex of its flight, and it begins its downward decent, as shown. When its height above the field is h = 1.2 m, the horizontal and vertical components of its velocity are observed to have the values Uhorizontal = 17 m/s and Uvertical = 4.25 m/s, respectively. Use a Cartesian coordinate system with the origin located at the initial position of the football. Ignore air resistance. V0,z vertical, Part(a) Determine the magnitude of the horizontal component of the football's initial velocity vo,z, in terms of Uhorizontal. Uvertical, 9, and h. Part (b) Calculate the time, in seconds, from when the football left the ground until it is descending at a height of h= 1.2 m. t = 0.8660 s X Attempts Remain horizontal

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Projectile Motion