MHB Why Do Vehicles Moving North-South Have East-West Velocity Components?

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Vehicles moving north-south can exhibit east-west velocity components due to the curvature of the Earth and the influence of wind or road conditions. The speeds of the Toyundai and Chryssalt are given as 30 km/h and approximately 39 km/h, respectively, indicating that their actual trajectories may not align perfectly with the intended north-south direction. Factors such as lateral forces and the Earth's rotation can contribute to these east-west components. Understanding these dynamics is essential for accurate navigation and vehicle control. This discussion highlights the complexities of vehicle motion in relation to Earth's geography.
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there are 5 more questions on this which are more complicated but want to get this (a) first. assume by speed they mean magnitude of the vector.

Toyundai speed is $$30 \frac{km}{h} $$

Chryssalt speed is $$\approx 39 \frac{km}{h}$$
 
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The arithmetic looks fine, but the question doesn't. Why do vehicles working north-south have east-west velocity components?
 

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