Final answer:
In projectile motion, the speed of the projectile changes at different points of its trajectory. When a projectile reaches its highest point, its speed is equal to the initial speed divided by 4.
Step-by-step explanation:
In projectile motion, the speed of the projectile changes at different points of its trajectory. When a projectile reaches its highest point, its speed is equal to the initial speed divided by 4.
For example, if a projectile is launched with an initial speed of 40 m/s, at its highest point its speed would be 40 m/s divided by 4, which is 10 m/s.
This behavior occurs because the projectile's vertical velocity gradually decreases until it reaches zero at the highest point, and then starts increasing in the opposite direction as it comes back down.