A roller coaster is traveling at 13 m/s when it approaches a hill that is 400 m long. heading down the hill, it accelerates at 4.0 m/s 2. What is the final velocity of the roller coaster? Round your answer to the nearest whole number

The largest observatory complex in the world is on mauna kea, the tallest mountain on earth. what are some factors astronomers consider when selecting an observatory site? don’t forget practical ones. should astronomers, for example, consider building an observatory on denali (mount mckinley) or mount everest?