Ahorizontal force of 200n is applied to a 55kg cart across a 10m level surface. if the cart accelerates at 2.0m/s^2, then what is the work done by the force of friction as it slows the motion of the cart?

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.