Understanding Tennis Ball Launchers in Physics

What is the launch velocity of the ball from the 3rd floor?

Answer:

Launcher A and Launcher B both launch tennis balls that land in the same spot at the same time. Therefore, the launch velocity of the ball from Launcher A is equal to the launch velocity of the ball from Launcher B, which is 20 m/s.

Explanation:

In this scenario, Launcher A is on the 3rd floor and Launcher B is on the 4th floor. Both balls are launched at the same time and land in the same spot at the same time. Since the balls land in the same spot, we can conclude that their horizontal displacements are equal. Launcher B launches the ball horizontally at 20 m/s. The horizontal velocity of a projectile remains constant throughout its motion.

Hence, the horizontal velocity of the ball launched from Launcher A must also be 20 m/s. Therefore, the launch velocity of the ball from Launcher A is also 20 m/s.