1. "William Tell is said to have shot an apple off his son's head with an arrow. If the arrow was shot with an initial speed of 55m/s and the boy was 15m away, at what launch angle did Bill aim the Arrow? (Assume that the arrow and the apple are initially at the same height above the ground.)" 2. Relevant equations 3. The attempt at a solution Change in X is 55m/s*cos(theta)*t Change in Y is 55m/s*sin(theta)*t - (4.9*t^2) Need to solve for either time or theta in order to get the other from what I can see? Is there another way? Or am I wrong all together? Didn't mention, I don't need the answer; I have it. I just need a reliable way to solve it. A very in depth-step-by-step with explanations would be very beneficial to me, thank you. And my teacher is also not looking for an answer, so don't fret about "cheating," the assignment was given in order to further understanding of the topic and to be able to solve more similar problems in the future.