public float distance(Vector2f v) {
        return FastMath.sqrt(distanceSquared(v));
    }
Returns the distance between the current instance and the argument. The
current instance is unaffected.

@param v the vector to compare (not null, unaffected)
@return the Euclidean distance (not negative)
jme3-core/src/main/java/com/jme3/math/Vector2f.java