for this scenario im confused. i know how to find the Vix and Xf, but do not understand why my professor found Viy by putting a negative sign in front of the 6.5m/s: Jack throws a baseball out of his dorm window to Ali, who is waiting below to catch it. Jack throws the ball at an angle of 30 below horizontal with a speed of 6.5 m/s, and Ali catches it 2.8 s later. a)How far from the base of the dorm does Ali stand to catch the ball? b) How high is Jack's dorm room