If a person is pushing a cart with a force of 40 Newtons and it accelerates at 0.5 m/s², what is the mass of the cart?

80kg

Explanation:

A = Fm

0.5 = 40m

m = 40/0.5

m = 80kg

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.