Enter the launch speed, angle and height to get range, maximum height and flight time.
From ground level: range = v² sin 2θ ÷ g; maximum height = v² sin²θ ÷ 2g; time of flight = 2v sin θ ÷ g.
20 m/s at 45°: range = 400 × 1 ÷ 9.81 ≈ 40.8 m, maximum height = 400 × 0.5 ÷ 19.62 ≈ 10.2 m, flight time = 2 × 20 × 0.707 ÷ 9.81 ≈ 2.88 s.