trucks travels beneath an airplane..... 1. The problem statement, all variables and given/known data A truck travels beneath an airplane that is moving 180 km/h at an angle of 39 to the ground. How fast must the truck travel to stay be- neath the airplane? What is the magnitude of the vertical component of the velocity of the plane? Answer in units of km/h 2. Relevant equations My physics teacher said the question is identifying the horizontal and vertical components. So I had to do Vcostheta and Vsintheta. 3. The attempt at a solution Vcostheta=180cos39=139.8863 km/h vsintheta=180sin39=113.2777 km/h my problem is, I don't understand which direciton the vectors are. Is it going north of east or south of east, or what? I can't identify them in the problem and I can't tell if the answers need a negative sign or positive sign.