Final answer:
At its maximum height, the ball's speed is zero.
Step-by-step explanation:
When a ball is thrown vertically upward, it reaches a maximum height before falling back to the ground. At its maximum height, the ball's speed is zero because it momentarily stops before changing direction and falling back down due to gravity. So, at the maximum height of 30 meters above the surface of the Earth, the speed of the ball is zero.
At the point when a ball is tossed upward vertical, it encounters a lessening in speed until it arrives at its greatest level. At the most extreme level, the ball quickly grinds to a halt prior to falling down. Therefore, the ball has no speed when it reaches its highest point.