# How do you determine the maximum height of a projectile?

##### 1 Answer

You use the fact that the *vertical component* of the initial velocity is **zero** at maximum height.

#### Explanation:

When you launch a projectile at an angle **vertical** and a **horizontal** component.

In order to determine the maximum height reached by the projectile during its flight, you need to take a look at the *vertical component* of its motion.

**Vertically**, the motion of the projectile is affected by gravity. This means that at **maximum height**, the *vertical component* of the initial speed will be **zero**.

The projectile will *decelerate* on its way to maximum height, come to a complete stop *at maximum height*, then starts its free fall descent towards the ground.

If you use the vertical component of its initial speed, you can write

This is equivalent to

The maximum height reached by the projectile will thus be