Answer:
c.
Explanation:
If the object starts to slide it must be on a slope.
There are 2 forces acting on the object - gravity and the friction between the object and the surface.
If sliding starts then the forces must be unbalanced.
The force of gravity is greater than the friction.
Acetaldehyde<span> Chemical Compound</span>
Hydrogen is the most common element in the universe. Hydrogen is most often classified as a nonmetal because it has many of the properties of nonmetals. For example, it is a gas at room temperature. However, hydrogen shares properties with the alkali metals in group 1.
They all have the same number of protons and electrons but differ in the number of neutrons because they are isotopes.