Net force on a cart at constant velocity and forces on a thrown baseball

[logit167]

Suppose I am pulling on a cart at a constant velocity, what is my net force. Is it zero?

If I throw a baseball in the air, neglecting air resistance, what does the ball experience when it comes out your hand and before it hits the ground? does it experience it's weight and also a decreasing upward force.

 

[Zizy]

Net force is zero if there is no friction.
Well, ball feels the same force (assuming both events are on equal height, like I think it was meant)