Question 491861
the ball traveled 24.4 m (36.6 - 12.2) in 2 sec for an average velocity of 12.2 m/s


the velocity at the window is the initial velocity PLUS 2 seconds of gravitational acceleration
___ Vf = Vi + 2(9.8) ___ Vf - 19.6 = Vi


Vave = (Vf + Vi) / 2


substituting ___ 12.2 = [Vf + (Vf - 19.6)] / 2 ___ 24.4 = 2 Vf - 19.6 ___ 22.0 = Vf