If the angular momentum of a planet of mass m , moving around the Sun in a circular orbit is L , about the center of the Sun, its areal velocity is:

Step-by-step solution

d A → = 1 2   r → × v → d t d A → d t = areal velocity = 1 2   r → × v → = 1 2 r → × m v → m = 1 2 m   L d A d t = L 2 m