def momentum(vector):
    """ Computes the momentum of a vector.

    Parameters:
        - `vector` : :class:`list`  of :class:`floats`

    Moentum is computed as follow:
        - momentum = 100*(new - old)/old

    Returns the momentum of the vector (:class:`float`)
    """
    return 100*((vector[0] - vector[-1])/vector[-1])