8. a 30 kg wagon with a 70 kg silly boy (not named robert) starts from rest at the top of a 10 meter
high hill and rolls down to the bottom of the hill where they hit, and compress, a heavy spring which
brings them to rest. ignoring friction, find the following:

real, smaller and upside-down.   so the answer should be b.

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.