In physics, equations of motion are equations that describe the behavior of a physical system in terms of its motion as a function of time. The slope of a velocity vs.Projectile refers to an object that is in flight after being thrown or projected. Figure 1 shows an object moving in a circular path at constant speed. The direction of the instantaneous velocity is shown at two points along the path. The period, speed and acceleration of a satellite are only dependent upon the radius of orbit and the mass of the central body that the satellite is orbiting. In these equations, we mean that the particle has position x0 and velocity v0 at time t = 0; it has position x and velocity v at time t. The slope of a velocity vs. Write Standard Form (when given two points). Check the forms to make sure they are complete.