Explanation:
The box has no acceleration in the perpendicular direction, so the net force in that direction is 0.
Sum of forces in the parallel direction:
∑F = f − F∥ − mg∥
∑F = f − F cos φ − mg sin θ
Velocity is measured in units of length per time
Velocity of the plane relative to the air = +400.0 m/s
Velocity of the air relative to the ground = -35.0 m/s (negative because it's moving opposite to the eastward direction)
Velocity of the plane relative to the ground = (velocity of the plane relative to the air) + (velocity of the air relative to the ground) = 365.0 m/s to the east
Umm....."the following"? what do u mean? i can help u, but i need full question to do so.