John Jacob Jingleheimer Thompson got onto his rocket sied. After the sled was traveling at 9 m/s, he engaged the engines which accelerated the rocket at 15 m/s2. How fast was john moving after 7 seconds?

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.

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome