Question

when describing motion, what is the frame of reference? (1 point)
a system of reference points used to determine position and velocities of objects
the point of origin of the motion.
any numerical measurement of the motion.
an x - y grid with yourself at the origin.

Explanation:

A frame of reference is a set of reference points used to measure the position and velocities of objects. It provides a context for describing motion. The point of origin is just part of it, numerical measurements are results within it, and an x - y grid with oneself at the origin is a type of frame but too specific. The general definition is a system of reference points for position and velocity determination.

Answer:

A. A system of reference points used to determine position and velocities of objects