13. A professional skydiver, Judith, jumps out of an airplane and reaches a constant terminal veloci Her speed does not increase. Air resistance equals to the downward force of gravity, 600 N. The magnitude and direction of the net force is A. 0 Newtons down, balanced B. 0 Newtons down, unbalanced C. 1,200 Newtons down, balanced D. 1, 200 Newtons dawn, unbalanced and forces are ​