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Here is our velocity equation:

There are other popular ways to write the symbols in this equation.

More that one symbol exists for the ** original
velocity**. All three of these symbols are the same
idea:

v_{o} |
Original velocity |

v_{i} |
Initial velocity |

v_{1} |
First velocity |

And there is more that one symbol for the ** final
velocity**. Both of these symbols mean the same thing:

v_{f} |
Final velocity |

v_{2} |
Second velocity |

Basically, these velocity symbols fall into two families.

These go together in one family:

v_{o}, v_{i}, and v_{f}

These go together in another family:

v_{1} and v_{2}

So, using the first family of velocity symbols, note that these two equations mean the same:

Using the second set of symbols, again, we say the identical idea with this notation:

When you write the equation, you would
never mix a symbol from one family with a symbol from
another. So, you would ** not** write something
like this:

A very good way to think about our velocity equation is that it will give you the velocity of the object, (final velocity), at any given time. You would need to know the original velocity, of course. That would be a known fixed quantity, or constant.

That is, our velocity equation can be
thought of as a ** function**. It would be

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