A ball is thrown so that the motion is defined by the equations x = 5t and y = 2 + 6t - 4.9t 2 , where x and y are expressed in meters and t is expressed in seconds. Determine (a) the velocity at t =1s, (b) the horizontal distance the ball travels before hitting the ground. ANS. (a) 6.28 m/s, (b) 7.49 m An airplane used to drop water on brushfires is flying horizontally in a straight line at 180 mi/h at an altitude of 300 ft. Determine the distance d at which the pilot should release the water so that it will hit the fire at B. ANS. 1140 ft