You are standing at the top of a cliff that has a stairstep configuration. There is a vertical drop of 6 m at your feet, then a horizontal shelf of 6 m, then another drop of 4m to the bottom of the canyon, which has a horizontal floor. You kick, a .72 kg rock,giving it an inital horizontal velocity that barely clears the shelf below. The acceleration of gravity is 9.8m/s^2. Consider air friction to be negligible. What initial horizontal velocity veloctiy v will be required to barely clear teh edge of the shelf below you? Answer in units of m/s. sorry this one i dont really haev a clue on what should i be looking at?