## Formula

** General **: Define recovery coefficient E = (V '_{ 2 } -v' _{ 1 } _{ 1 } >) / (V _{ 1 } -v _{ 2 }), if only the altitude collision is considered, the relative speed is opposite to each other because there is a relative speed before the collision collision, there is V '_{ 2 } -v '_{ 1 } = - E (V _{ 1 } -v _{ 2 }) (1)

Using the definition of zero and relative speed using a degree of magistrate, it is easy to introduce a speed expression after collision in a cuspcle. Finally, it is easy to get a collision speed after the expression in the expression:

Take E = 1 to obtain a speed expression after complete elastic collision.

** Using the recovery factor ** E = (V '_{ 2 } -v' _{ 1 }) / (v _{ 1 < / sub> -v 2 ) and momentum conservation law can derive the speed formula after the elastic collision: }

If the recovery coefficient is equal to 1, there is a formula:

Motorcycle Conservation Law Formula:

Putting two formulas to solve the equation:

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** or, regressing high school physics **: Set two object quality

momentum conservation:

Energy Conservation Law:

Two objects collision speed:

Note: Speed

## Properties

The following formula can be obtained as the following properties:

1. (only the core collision)

2. Total momentum

3. If

## Other

The type of collision is also: completely elastic collision, non-elastic collision, completely non-elastic collision.