alleryStart learning →A driver steadily increases speed from 30 km/h to 60 km/h. What is the average velocity during this steady increase?
A30 km/h
B45 km/h
C50 km/h
D90 km/h
Answer & Solution
Correct answer: B. 45 km/h
1. When acceleration is constant, the average velocity is the simple average of the initial and final velocities.
2. Substitute the values: (30 km/h + 60 km/h) / 2.
3. This gives 90 km/h divided by 2, which is 45 km/h.
4. Quoting 90 km/h adds the two velocities and forgets to halve the sum.
_Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.5 Motion Equations for Constant Acceleration in One Dimension_
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