Treating systems (the easy way) | Forces and Newton's laws of motion | Physics | Khan Academy

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David shows the easier way to find the acceleration of two masses connected by a rope.

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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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