Convert 25 cm to km using the method of dimensional analysis

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

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader

The energy produced as a result of this flow of electrons from atom to atom is called