You are standing at the top of a cliff that has a stairstep configuration.

You are standing at the top of a cliff that hasa stairstep configuration. There is a verticaldrop of 6 m at your feet, then a horizontalshelf of 7 m, then another drop of 4 m to thebottom of the canyon, which has a horizontalfloor. You kick a 0.45 kg rock, giving it aninitial horizontal velocity that barely clearsthe shelf below.What initial horizontal velocity v will be required to barely clear the edge of the shelf below you?