What is PROJECTILE MOTION??? This video shows how to solve a physics problem involving horizontally launched projectiles. In this video, a coin is rolled off a roof. It is a classic 2D kinematics problem. See how I use a chart to organize the information. You'll identify the vf, final velocity, vi, initial velocity, the acceleration both downwards and outwards, and the displacement or distance downward and outwards. It's an awesome video. Check it out.