In this video, David shows how to solve elastic problems the hard way. In other words, using conservation of momentum and conservation of kinetic energy, David substitutes one equation into the other and solves for the final velocities.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
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