Question

which is a valid velocity reading for an object?
○ 45 m/s
○ 45 m/s north
○ 0 m/s south
○ 0 m/s

Explanation:

Velocity is a vector quantity requiring both magnitude and direction. 45 m/s north has a speed (magnitude) of 45 m/s and direction north, satisfying vector requirements. 45 m/s and 0 m/s lack direction (scalars). 0 m/s south is invalid because zero magnitude makes direction irrelevant.

Answer:

B. 45 m/s north