A softball is hit over a third baseman's head with speed v_0 and at an angle theta from the horizontal. Immediately after the ball is hit, the third baseman turns around and runs straight back at a constant velocity V = 7.000m/s, for a time t=2.000s. He then catches the ball at the same height at which it left the bat. The third baseman was initially L=18.00m from the location where the ball was hit at home plate. Express the initial speed.