She is running west at 2.4 m/s uses the correct SI units to describe the velocity of the runner. thus option B is correct.
Velocity is a term that describes the speed and direction of a point's motion.
Meter per second (m/s) is the metric unit of velocity. Centimeters per second (cm/s) can also be used to describe the velocity magnitude.
Since m/s is the SI unit for velocity and since velocity must be in a certain direction, the best response is:
B. At 2.4 m/s, she is moving westward.
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