How to calculate the distance the mouse will move?

Sorry to bother you, because this is not an issue exactly.

I'm learning from the source code, but I can't understand this sentence:

``` js
let x = position.x + 100 * Math.pow(1 + velocity.x, 2) * sign(velocity.x);
```

I think `100 * (1+velocity.x)^2` mey be a formula to calculate the displacement, but I can't describe where the 100 and 1 come from.

Could you please help me?

Start with the source-code expression containing position, velocity, Math.pow, and sign. Trace where those values and the sign function are defined, then document what the calculation represents and where the constants 100 and 1 come from. Done means the formula's intent and inputs are explained clearly.

Written by the indexing model from the issue text.