Was Crocodile stronger at Marineford? Or was he holding back in Alabasta?

 During the Alabasta arc, Crocodile displayed a level of power that was initially considered overwhelming by the Straw Hat Pirates. He possessed the Logia-type Devil Fruit called the Suna Suna no Mi (Sand-Sand Fruit), which granted him the ability to control and transform into sand. He had a reputation as a Shichibukai and controlled the desert kingdom of Alabasta from the shadows. His strength was showcased through his battles with Luffy and others. At Marineford, Crocodile was present as part of the war that took place at Marine Headquarters. While he did participate in the battle, he didn't display the same level of dominance as some other powerful characters present. This has led fans to speculate that he might not have been as strong as initially portrayed in Alabasta. It's important to note that power scaling and character abilities can be subject to interpretation and development by the author. Oda often keeps details deliberately open-ended to keep the story intriguing.

What is the trajectory of an artillery shell?

 The trajectory of an artillery shell is the path that the shell follows as it is propelled through the air after being fired from an artillery gun. The trajectory of an artillery shell is determined by a combination of factors, including the initial velocity of the shell, the angle at which the gun is elevated, and the effects of gravity and air resistance.

The initial velocity of the artillery shell is determined by the force with which the shell is propelled from the gun. This is typically achieved through the use of an explosive charge, which produces a high-pressure gas that propels the shell out of the gun barrel.

The angle at which the gun is elevated also plays a role in determining the trajectory of the shell. A higher elevation angle will result in a higher initial height and a longer range, while a lower angle will result in a lower initial height and a shorter range.

Gravity and air resistance also affect the trajectory of an artillery shell. Gravity causes the shell to fall toward the ground as it travels, while air resistance slows it down and can cause it to change direction. The combination of these forces determines the shape of the shell's trajectory, which can be described as a parabolic curve.

Overall, the trajectory of an artillery shell is a complex combination of initial velocity, elevation angle, gravity, and air resistance, and it can be difficult to predict with precision. However, advances in technology have made it possible to develop more accurate methods for predicting and controlling the trajectory of artillery shells, which has improved their effectiveness as a weapon.