An airplane pilot wishes to fly due west. a wind of 80.0 km> h (about 50 mi > h ) is blowing toward the south. (a) if the airspeed of the plane (its speed in still air) is 320.0 km> h (about 200 mi> h ), in which direction should the pilot head?

let the plane is flying at some angle theta with west towards north

Now we can use the components

now since plane has to fly towards west so net speed in north must be equal to speed in south for air

So we can say

so plane has to fly in direction 14.5 degree North of west

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement