Convert velocities/accelerations to units of UnitConverter.

        Converts velocity/ies and/or acceleration/s from units of motor
        pitch per second (or second squared) to that of this
        UnitConverter.

        Parameters
        ----------
        va : int, float, or iterable of ints and floats
            The velocities/accelerations to convert.

        Returns
        -------
        converted_va : float or list of floats
            The converted velocities/accelerations.

def to_unit_velocity_acceleration(self, va):
        """ Convert velocities/accelerations to units of UnitConverter.

        Converts velocity/ies and/or acceleration/s from units of motor
        pitch per second (or second squared) to that of this
        UnitConverter.

        Parameters
        ----------
        va : int, float, or iterable of ints and floats
            The velocities/accelerations to convert.

        Returns
        -------
        converted_va : float or list of floats
            The converted velocities/accelerations.

        """
        if isinstance(va, collections.Iterable):
            return [(x / self._va_to_motor) for x in va]
        else:
            return va / self._va_to_motor