Dynamics- Projectiles and the envelope equation

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The question asks: A ball is launched from the origin O at ground level V We've been asked to derive the envelope of trajectories equation which I did fine. Then it says: A vertical wall of height H is placed a horizontal distance D from O. Find the minimum height H=Hmin that will ensure the ball cannot get over the wall. How would I go about doing this? Im guessing as we've been asked to derive the envelope equation we use this? Not sure where to go from here!