An airplane is moving to the south with a speed of 110 m/s while maintaining a constant altitude. It continues moving in this direction at this speed for 16 seconds. During this time, what is the direction of the net force exerted on the airplane

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass