1. The problem statement, all variables and given/known data The question states : Romeo tosses a pebble at Juliet's window to wake her. Unfortunately, he throws too large a pebble too fast. Just before crashing through the glass, the pebble is moving horizontally, having traveled a horizontal distance x and a vertical distance y as a projectile Find the magnitude of the pebble's velocity as it leaves Romeo's hand. 2. Relevant equations Unsure, thinking of something like kinematic equations 3. The attempt at a solution It says just before crashing the glass the pebble is horizontal, I related that fact to a parabolic trajectory where the apex of the upside down parabola is where the pebble breaks the glass, I have 2 known things gravity = 9.8m/s^2 and the final velocity at apex is 0m/s in the Y axis, I am unsure what other information I can use and what equations to use to solve this problem please help!