Here's why:
* Neglecting Air Resistance: When we talk about projectile motion, we often neglect air resistance for simplicity. This means the only force acting on the projectile is gravity.
* Constant Acceleration: Gravity exerts a constant downward force on all objects near the Earth's surface, resulting in a constant acceleration of approximately 9.8 m/s². This means the projectile's velocity increases by 9.8 m/s every second it falls.
Important Note:
* Air Resistance Matters: In reality, air resistance does play a role, and its effect depends on the projectile's shape, size, and speed. Air resistance will slow the projectile down, making its acceleration less than 9.8 m/s².
* Varying Gravity: The acceleration due to gravity is not perfectly constant. It varies slightly depending on your location on Earth. However, for most practical purposes, 9.8 m/s² is a good approximation.
Let me know if you have any other physics questions!
