how much force would bob need to move the 200 kg fridge to the food court if he accelerates the fridge at 5m/s2

there are no correct statementd on the list of choices you provided.

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.

it is a negative acceleration