A roller coasters velocity at the top of the hill is 15 m/s. Two seconds later it reaches the bottom of the hill with a velocity of 30 m/s. What is the acceleration of the coaster?

Please help due today

2b2t

explanation:

2b2t

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.