an When we say we analyze bodies as particles, we mean that O we only consider particles that are infinitesimal O we consider their motion as an entire unit; we neglect any rotation about their own center of mass 0 rotation is not negligible, we cannot neglect the effect rotation O we assume that the body is infinitesimal small Question 3 (1 point) ~/ Saved E-Il The only variables we need to describe rectilinear motion (moving along a straight line) are time (t) and distance (x). With these we can define the particle's 0 position and velocity, we need a third variable to completely describe the motion 0 position, velocity, and acceleration, which completely describes the particle's motion. velocity and acceleration, we need a third variable to completely describe the motion 0 position and acceleration, we need a third variable to completely describe the motion