Which unit does not measure power? N∙m/s J/s N/s W

The resultant velocity of the plane relative to the ground is;

150 kh/h north

Explanation:

The flight speed of the plane = 210 km/h

The direction of flight of the plane = North

The speed at which the wind is blowing = 60 km/h

The direction of the wind = South

Therefore, representing the speed of the plane and the wind in vector format, we have;

The velocity vector of the plane = 210.

The velocity vector of the wind = -60.

Where, North is taken as the positive y or direction

The resultant velocity vector is found by summation of the two vectors as follows;

Resultant velocity vector = The velocity vector of the plane + The velocity vector of the wind

Resultant velocity vector = 210.  + (-60.) =  210.  - 60. = 150.

The resultant velocity vector = 150.

Therefore, the resultant velocity of the plane relative to the ground = 150 kh/h north.