A fighter plane enters inside the enemy territory at time t = 0, with velocity v0 = 250 m/s and moves horizontally with constant acceleration a = 20 m/s2 as shown in fig. (3).An enemy tank at the border, spot the plane and fires shots at an angle θ = 60o with the horizontal and with velocity u = 600 m/s. At what altitude H of the plane it can be hitted by the shot?