After Chris does 180.0 J of work and friction does -250.0 J of work, the same 30-kg box is moving at 2.5 m/s. What was the box’s initial speed?

a and c

c is 100% but i am confused in a

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.