But when you throw the ball downward, gravity is pulling the ball in the direction that it's moving and gravity does positive work on the ball.
(you; throw downward; the ball) (gravity; is pulling; the ball; in the direction; T:when you throw the ball downward) (it; 's moving; ) (gravity; does; positive work)
you gravity it gravity
throw downward is pulling 's moving does
the ball
the ball in the direction T:when you throw the ball downward
positive work