There have been different models of the atom over time. How has the competition between these models affected our understanding of the atom?

The atomic model has become more accurate because of this competition.
The atomic model has become a less accurate representation of the actual atom.
We understand less about the atom due to these competing models.
We are less able to design reliable products based on atomic theory.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.