Launch angle Definition and 54 Threads

The launching speed of a certain projectile is 5.2 times the speed it has at maximum height. What is the elevation angle at launching? Could someone just give me a starting point or a hint in the right direction? I know that the horizontal velocity doesn't decrease, and the vertical...

Deriving a Launch Angle Equation -- Projectile Motion -- Please Help This is physics in the area of projectile motion. My class and I are doing a lab where we have to calculate the launch angle in order to perform a successful lab. The experiment is as follows: the projectile launcher releases...

Here is my problem, can anyone help me out? Prove the maximum range of a skier going down a ski jump is given by (theta) = 45degrees - phi/2 , where theta = optimal launch angle , phi = slope angle of take off with respect to the incline of the hill. I have the following equations to use...

My physics class project is to construct a catapult. My question is what is the optimum launch angle for distance. This was posted awhile back by someone else, but i can't find the post again. I think it said that because of air resistance an angle slightly above 45 degrees is optimum for...