alleryStart learning →An aircraft passenger takes 5 s to move -4 m along the cabin. What is his average velocity?
A-0.8 m/s
B-1.25 m/s
C+0.8 m/s
D-20 m/s
Answer & Solution
Correct answer: A. -0.8 m/s
1. Average velocity is the displacement divided by the elapsed time.
2. Substitute the values: (-4 m) / (5 s) = -0.8 m/s.
3. The minus sign shows the average velocity is towards the rear of the cabin.
4. Dividing the time by the displacement instead gives -1.25 m/s, with the wrong units.
_Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.3 Time, Velocity, and Speed_
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