A jet aircraft has minimum safe air-speed 300 km h⁻¹. At take-off an eastward wind may have any speed from 0 to 30 km h⁻¹. Ignoring fuel cost, which procedure is safest while using as little fuel as possible?
Select all that apply

Question

A jet aircraft has minimum safe air-speed 300 km h⁻¹. At take-off an eastward wind may have any speed from 0 to 30 km h⁻¹. Ignoring fuel cost, which procedure is safest while using as little fuel as possible?

Select all that apply

G1 Physics · Accepted Answer

Taking off westward makes the eastward wind add to the aircraft's air-speed. A westward ground speed of 320 km h⁻¹ guarantees an air-speed of at least 320 km h⁻¹ even if wind is zero. The source key gives option B.