This physics video tutorial explains how to solve relative velocity problems in two dimensions using a frame of reference. It covers airplane problems and river boat problems as well as a problem where two cars are approaching each other perpendicularly at right angles. This video explains how to find the velocity of the boat crossing a river relative to the shore (both magnitude and direction angle) and how to find the velocity of a plane relative to the ground with a crosswind or a tailwind. This video contains plenty of examples and practice problems with the equations and formulas.
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