Projectile Max Height
Peak height reached by a launched projectile.
Formula
Variables
Example
20 m/s at 60°: H = 400×0.75÷19.62 ≈ 15.3 m
How it works
This formula gives the highest point a projectile reaches when it is launched and then moves under gravity alone, assuming air resistance is negligible. It comes from splitting the launch velocity into vertical and horizontal parts: only the vertical component, v sinθ, determines how high the object rises, and gravity slows that upward motion until the vertical speed becomes zero at the top. Using the constant-acceleration equation for vertical motion leads to H = (v^2 sin^2θ) / (2g).
When to use it
Use this when analyzing the peak height of a kicked ball, thrown object, launched projectile, or any motion where the object follows ideal projectile motion. It is especially useful in sports science, physics problems, and trajectory calculations where launch speed and angle are known.
Worked example, step by step
A javelin is launched at 18 m/s and 45°. Step 1: Square the speed: v^2 = 18^2 = 324 Step 2: Find sinθ and square it: sin45° = 0.7071, so sin^2 45° ≈ 0.5 Step 3: Multiply the top: 324 × 0.5 = 162 Step 4: Multiply the bottom: 2g = 2 × 9.81 = 19.62 Step 5: Divide: H = 162 ÷ 19.62 ≈ 8.25 m Final answer: The maximum height is about 8.3 m.
Common mistakes to avoid
- Using cosθ instead of sinθ, which gives the horizontal component instead of the vertical one
- Forgetting to square the sine term or the speed, which changes the result a lot
- Using a different value of g without checking units, especially mixing m/s² with other gravity values
Did You Know?
A football kicked at 60° climbs higher but lands shorter than one at 30° with the same speed.
Share this formula
More in Sports & Motion Analytics
View allProjectile Range
IntermediateHorizontal distance a ball travels when launched at speed v and angle θ.
Hang Time
BasicTotal time a projectile spends in the air on level ground.
Running Pace
BasicTime taken per unit distance — the runner's pace.
Speed from Pace
BasicConvert a running pace in min/km into speed in km/h.
Expected Goals (xG)
IntermediateSum of scoring probabilities of every chance a team creates.
Elo Rating Update
IntermediateUpdates a player's rating after a game based on result versus expectation.