A real-world roller coaster released at point A and coasting without external power would traverse a track somewhat like the figure above. Friction is not negligible in the real world. Does the roller coaster have the same energy at points B and C? Is the total energy conserved during the coaster ride? Can you account for all the energy at any point on the track?

the answer would be 32*f

f=ma newton

f=100x2.5=250n

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.