1. The problem statement, all variables and given/known data A flat roof has a height of 65m above the ground. A tennis ball rolls off the edge of the roof and hits the ground at a point 418m horizontally from the edge of the roof. A.) How much time is the ball in the air? B.) What is the magnitude of the initial velocity? 2. The attempt at a solution I'm fairly positive that the answer to A is 3.64 seconds, but I'm having trouble understanding how to get the magnitude of the initial velocity and what it is exactly.