use solving relative velocity problems

1. An airplane flies with an airspeed of 50.0 mfs [E 40 N]. If the velocity of the airplane, according to an observer on the ground, is 30.0 mfs [SE], what is the wind velocity? 2. Examine the scenario introduced at the beginning of the learning activity, taking into consideration what you have learned so far about relative velocities. The scenario involved a canoe race across a river. Imagine, now, that you are taking part in the race and desperately want to reach the other side first, regardless of where you land on the opposite side. How can you do it? it Should you aim to cross the river somewhat upstream, to counteract the effect of the current? it Should you aim to cross somewhat downstream, to travel with the current? it Should you travel straight across, perpendicular to the current