Why is it important to break down a long-term physical fitness goals into short-term physical fitness goals?

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Does anyone have the answers to online physics course plato course physics, semester a v3.0

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