The airspeed of an airplane is 100 km/h. When it is caught in a 100-km/h right-angled crosswind, its speed across the ground below is about
1) 0 km/h.
2) 100 km/h.
3) 140 km/h.
4) 200 km/h.
5) more than 200 km/h.
If the airplane changes direction and flies at 60 degrees to the wind, its ground speed will
6) decrease.
7) remain the same.
8) increase.
Answer: 3, 8
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