Answer to Question #139885 in Physics for Brayden

Question

An airplane whose airspeed is 200km/h flies with a headwind that has a speed of 90km/h. What is the speed of the plane relative to the ground

Answer 1

"Headwind" means, that the velocity of the wind is opposite to the velocity of the airplane. Thus, in order to find the resultant speed, one should subtruct those velocities:

$$v = v_{airplane} - v_{wind} = 200km/h - 90km/h = 110 km/h$$

Answer. 110 km/h.