NodeJS module to calculate linear motion
Nice documentation. This code is clear and easy to read. Here are some basic nits:


You should probably follow standard JSDoc conventions. Don't do this:

/**
*
*/


Do this instead:

/**
 *
 */


If you're nitpicky about the @param, Float technically doesn't exist since all JavaScript numbers are floats. Use Number instead.
See this SO post about rounding to 2 decimal places. Using it is completely up to you, there's nothing wrong with the way you're doing it. (This suggestion is slower, but looks cool I guess)

const round = val =&gt; {
    return +val.toFixed(2);
};

You know the constraints of your areValuesValid() function, there's no need to === false.

const calculateTime = (velocity, distance) =&gt; {
    if (areValuesValid(velocity, distance) &amp;&amp; parseFloat(velocity) !== 0) {
        return round(distance / velocity);
    }
    return 0;
}


Also, why the need to do parseFloat(velocity)? If you know all your arguments will be numbers, this is unnecessary. If you don't know the data type of your arguments, you should probably enforce that they are numbers using typeof.


Happy coding!