Una persona (que no es un objeto puntual, pero está hecha de objetos puntuales) se sitúa a 20 m de un espejo plano. ¿A qué distancia ve su propia imagen? ¿Cómo es la imagen? (real/virtual, directa/invertida, mayor/igual/menor)

The difference between two numbers is 15. when twice the smaller number is subtracted from three times the larger number, the difference is 58.what is the larger number?

You will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. (refer to the walk-through video to locate the online lab within the online textbook).

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