alleryStart learning →A train has a displacement of -1.50 km and takes 5.00 min to make the trip. What is its average velocity?
A-7.50 km/h
B-0.300 km/h
C-18.0 km/h
D-30.0 km/h
Answer & Solution
Correct answer: C. -18.0 km/h
1. Average velocity is the displacement divided by the elapsed time.
2. Substitute the values: (-1.50 km) / (5.00 min).
3. Convert minutes to hours: multiply by 60 min per 1 h.
4. This gives (-1.50 km / 5.00 min) x (60 min / 1 h) = -18.0 km/h.
5. Forgetting the conversion leaves -0.300, which is in km per minute.
_Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.4 Acceleration_
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