Motion with constant velocity
The distance traveled is the product of velocity and time.
were,s = distancev = velocityt = time
It follows that
Motion in a current of water or air
Letx = velocity of the (boat/airplane) in still (water/air) andy = velocity of the (water/air), then
x + y = velocity when going (downstream/with the wind)x - y = velocity when going (upstream/against the wind)
Motion in a circle or any closed circuit
Consider two objects, one is a faster and the other is slower, moves from the same point and starting at the same time.
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