Atrain is travelling at 15m/s. it accelerates at 3m/s² for 20 seconds. how far does the train travel in this time?

What is the specific heat of wood ?

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?

First to answer will be the brainliest i need the answer asap