An athlete runs 1600 meters down a straight road. over the first 800.0 meters, his average velocity is 4.30 m/sec. what is te runners average velocity over the entire race?

good for her? ? where is the question?

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.