Gravity is a key force that affects projectile motion. A projectile only has one force acting upon it being gravity. Gravity affects all objects the same way regardless of their mass. The angle that maximizes the range of an object horizontally the most is 45 degrees. The angle that maximizes vertical displacement the most is 90 degrees. This is true because none of the energy is transferred into the horizontal direction and instead it is all directed towards the vertical direction. In order to achieve the farthest distance a baseball can be hit or throws, according to projectile motion, it has to be hit/thrown at an angle of 45 degrees. If you wanted to hit or throw the baseball as high as you could, you would have to throw/hit the ball at 90 degrees to maximize vertical displacement” (Physics of Baseball