Couple of Physics Question dealing with momentum, force, etc

[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)

 

[astrokreng]

In the first scenario, if you are pulling on a cart at a constant velocity, the net force on the cart would indeed be zero. This is because the cart is not accelerating, meaning the forces acting on it are balanced. Your pulling force is counteracted by the friction force of the ground, resulting in a net force of zero.

In the second scenario, when you throw a baseball in the air, the ball experiences its weight and a decreasing upward force due to the force of gravity. As the ball travels upward, the force of gravity causes it to slow down until it reaches its maximum height, where the upward force and the force of gravity are equal and opposite. As the ball falls back down, the force of gravity increases its speed until it hits the ground. Neglecting air resistance, the ball experiences a constant force of gravity throughout its entire trajectory.