I have several similair questions like this but i dont know where to start? Mabey iam using the wrong equation > d=vnaught(t)+1/2at^2 one of the questions states that a tennis ball is struck such that it leaves the racket horizontally with a speed of 29.5m/s. The ball hits the court at a horizontal distance of 20.6m from the racket. What is the height of the tennis ball when it leave the racket. I know iam looking for the distace, do i find time and then solve the above equation and if so how do i go about solving for time?