You are on an airplane traveling 30° south of due west at 160 m/s with respect to the air. The air is moving with a speed 41 m/s with respect to the ground due north.
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the velocity of the air is
41*sin30=20.5 m/s to west
41*cos30 = 35.5 m/s to north
the velocity of the plane to the ground is thus
160-20.5 = 139.5 m/s to east and 35.5 m/s to the north
the speed is sqrt(139.5^2+35.5^2) = 143.9 m/s
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