Esophageal cancer describes the disease where cells that line the esophagus change or mutate and become malignant. These cells grow out of control and form a mass or tumor. There are two main types of esophageal cancer:
Trajectory. A trajectory is the path that a moving object follows through space as a function of time. The object might be a projectile or a satellite, for example. It thus includes the meaning of orbitâthe path of a planet, an asteroid or a comet as it travels around a central mass.
Its path through space is called its trajectory. You can determine a projectileâs trajectory if you know its initial velocity. In this chapter, you will study two types of projectile motion. The top of Figure 1 shows water that is launched as a projectile horizontally. The bottom of the figure shows water launched as a projectile at an angle.