Question

a small airplane flies at a velocity of 145 km/h toward the south as observed by a person on the ground. The airplane pilot measures an air velocity of 172 km/h an hour. What is the velocity of the wind that affects the plane?

Answer 1

We apply the equation for the velocities adddition

`V=V(plane)+V(wind)`
From this equation we obtain the velocity of wind

`172=145+V(wind)`

`V=172-145 =27 (km/h)`
The air velocity is bigger for the pilot of the plane because the speed of the plane adds with the speed of the wind.