11 The x and y components act independently of each other. A bullet is fired horizontally and another is dropped at the same time fromthe same height. Which bullet hits the ground first?Neither. They hit at the same time.
12 The initial speed in the x direction is the initial speed of the object. The initial speed in the y direction is zero.The horizontal speed of a projectile is constant.The vertical motion of a projectile follows the same rules as free fall.
13 Horizontal (x) Vertical (y) d = d = v = a = t = t = d = vt d = ½ a t2 Where did vi t go?d = vi t + ½ a t2vi is zero, it cancels out
14 A football is thrown horizontally with a speed of 20 m/s. It hits the ground0.3 seconds later. What is the rangeof the ball?6.0mFrom what height was the ball thrown?0.44m
15 A projectile is launched horizontally from a height of 3.0 m. The range of theprojectile is 6.0 m. How long did it taketo land?0.78 sWhat was the initial speed of theprojectile?7.7 m/s