I can't figure this one out! Please help! You are standing on the edge of a ravine that is 15 m wide. You notice a cave on the opposite wall whose ceiling is 7.9 m below your feet. The cave is 5.8 m deep and has a vertical back wall. You decide to kick a rock across the ravine into the cave. Acceleration is 9.8 m/s^2. 1)What initial horizontal velocity must you give the rock so that the rock barely misses the overhang? 2) How far down the back wall of the cave will the projectile hit? Please help! THANKS!