The document provides instructions for solving "at a point" physics problems involving projectiles moving vertically under the influence of gravity. It gives the formula s(t)=-16t^2+vot+so for calculating the height s of a projectile at time t, where vo is initial velocity and so is starting height. It explains that you set s(t) equal to the given height and solve the resulting quadratic equation to find the time(s) when the projectile reaches that height. Two examples problems are included.