Posted by arsh on Saturday, July 23, 2011 at 7:25am.
The "x" (east-west) component of the wind velocity is Vwind,x = +3 km/h (from west to east). There is also a north-directed component of the wind velocity, Vwind,y
When walking at 7 km/h East into a wind with +3 km/h component E, the relative air velocity components are Vwind,y, and 4 km/h (from the east).
To have an apparent SW direction (from NE), the component Vy must be -4 km/h.
The actual wind velocity is 3 km/h (from west towards east) and -4 km/h (from north towards south)
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