Abook with a mass of 2.5 kg falls from a high shelf in a library. at a height of 2.0 meters its velocity is 2 m/s. what is the mechanical energy of the book?

answers are:

5j
44j
49j
54j

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions

What is the measurement of how fast an object moves relative to a reference point?