In this video, we'll talk about more general equations for gravitational force and gravitational [...]potential energy than the equations we've been using so far. Instead of good old mg, we'll use Newton's universal law of gravitation to look at the gravitational force between two objects. Similarly, instead of mgh, we'll discuss a more general equation for gravitational potential energy, and then we'll apply that equation to look at the speed a projectile would have to have at the Earth's surface so it never came back down again. That speed is known as the escape speed.

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