1. Total Energy: The total energy of a projectile, which is the sum of its kinetic and potential energy, remains constant. This means that as the projectile moves, its kinetic energy (energy of motion) and potential energy (energy due to its height) change, but their sum remains the same.
2. Horizontal Velocity: The horizontal component of the projectile's velocity remains constant throughout its motion. This is because there are no horizontal forces acting on the projectile (assuming we neglect air resistance). The horizontal velocity is determined by the initial velocity given to the projectile at the start of its motion.
3. Acceleration Due to Gravity: The acceleration due to gravity (g) remains constant throughout the projectile's motion. It acts vertically downward and has a magnitude of approximately 9.8 m/s² on Earth. This means that the projectile accelerates downwards at a constant rate, regardless of its horizontal motion.
These parameters remain constant because projectile motion is a two-dimensional motion under the influence of a constant acceleration (gravity) acting vertically downward.
