1. The problem statement, all variables and given/known data The speed of a projectile when it reaches its maximum height is 0.31 times its speed when it is at half its maximum height. What is the initial projection angle of the projectile? 2. Relevant equations h=(Vi^2 * sin^2 θ) / 2g R=(Vi^2 * sin2θ) / g 3. The attempt at a solution I realize that i need to somehow come up with a ratio and set the two equal to each other. However, i'm having difficulty with the initial step. Maybe I could get a hint that could set me on the right track?