Suppose one of the global positioning system satellites has a speed of 4.42km/s at perigee and a speed of 3.64km/s at apogee. if the distance from the center of the earth to the satellite at perigee is 2.24×104 , what is the corresponding distance at apogee?

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