Question

question 2
a marble rolls down a ramp and speeds up. what best explains this change in motion?
forces are balanced
an unbalanced force pulls the marble downhill
only upward forces act
no forces act on the marble

Explanation:

According to Newton's laws, an object's motion changes when an unbalanced force acts on it. Gravity creates an unbalanced force pulling the marble downhill, causing it to speed up.

Answer:

An unbalanced force pulls the marble downhill