Well, I took my Physics final today, and I passed it but I didn't do quite as well as I'd hoped. Anyway, there was one problem I spent tons of time trying to figure out. I've tried giving it a shot again at home, but it's still eluding me. Some guidance would be great! Sorry if this is vague, but I'm writing this from memory. 1. The problem statement, all variables and given/known data A ball is thrown from the ground and after 4 seconds lands on top of a building 20m high. When it lands, it is at an angle of 60°. Find the distance traveled and the angle from the ground with respect to the x-axis. Known: Landing Angle, θ=60° Time = 4s Height of building = 20m And my crude drawing is attached. 2. Relevant equations KE and PE Kinematics 3. The attempt at a solution I'm not trying to solve at this point, I just want to be able to find the first unknown. So I've tried everything I can think of to try. I was leaning toward using PE at the top of the curve to equal KE right before it hits. I'll call H the max height and h the height of the building. This would leave me with mgH = 1/2mv^2*sin(θ) + mgh From here, I have two unknowns. The final velocity and the maximum height, and it just seems like no matter what other equations I use, I still have two unknowns. Can someone give me a hint?