As you ski down the hill there are a lot of things you notice. Such as the next turn you will make, or where the tree you have to dodge is, or a big one, what little kid you have veer away from to prevent a crash. What you likely do not consider are things like your acceleration, the gravitational pull, potential energy and kinetic energy. These things are the factors that determine how your day on the mountain. For example the fasted skier in the world right now has a acceleration of 4.681m/s squared in 10 seconds.
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