In one of our college prep physics class we were doing a lab to explore projectile motion—figuring out how objects behave when they travel vertically and horizontally at the same time. We had two different types of projectiles (plastic and steel), and we were measuring the range of each projectile using our projectile launcher and carbon paper on the floor to mark the impact point. Using that range, we were able to work backwards and calculate the launch speed and then find the flight time of each projectile. Each lab group independently confirmed that the steel projectile had a smaller launch speed than the plastic projectile, and therefore spent less time in the air.