12.6 MOTION OF A PROJECTILE 51 12-86. Determine the minimum initial velocity vo and the corresponding angle 0, at which the ball must be kicked in order for it to just cross over the 3-m high fence. 00 6 m Prob. 12-86 3 m 2-87. The catapult is used to launch a ball such that rikes the wall of the building at the maximum height of ajectory. If it takes 1.5 s to travel from A to B, determ e velocity VA at which it was launched, the angle of releas nd the height h.