This is a series of six projectile motion problems I use with my students as an introduction to doing projectile motion calculations. I usually work the even numbers with my students and ask them to do the odd numbers on their own, as they are similar in style. For example, problems 1 and 2 are both projectiles that start at the highest point on a projectile's trajectory, so they are solved in the same manner. Because of this, I work the first problem with my students and then have them use that information to solve the second problem.
Before going over these problems with my students, I always start by introducing "the path of a projectile." I think it just helps them have a much better understanding of what is going on with the projectile, and thus have a better chance of finding the "implied values" (horizontal acceleration is zero, vertical velocity is zero at the highest point, etc.).