Answer:
position, direction & speed
Step-by-step explanation:
although I can't be 100% sure on this answer because I have no idea what your current unit looks like, as all of these factors are essential to describe some type of motion at some point or another in physics. generally speaking, in 2-D motion(most studied form of motion in high school courses), magnitude and direction are used most commonly to describe the motion of an object/s. all in all, the answer is dependent on what you're currently studying.