A girl is running the 200 m dash. She starts by accelerationat 8m/s^2 for 7s. Thencontinues at this speed until the end of the race. How long did it take for her to completethe race?

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