import math


def get_speed(velocity_vector):
    """ Compute the speed of the vehicle in m/s.

    Args:
        vehicle: A velocity vector.

    Returns:
        The speed of the given vehicle as a float in m/s.
    """
    speed = math.sqrt(velocity_vector.x**2 + velocity_vector.y**2 +
                      velocity_vector.z**2)
    return speed