Until a train is a safe distance from the station it must travel at 5m/s. once the train is on open track it can speed up to 45m/s. if it takes the train 8 seconds to reach 45m/s what is the acceleration of the train ?

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.

i think the answer is a, hope this : )