If a theory is studied in let's say the 17th century, the theory has had many years to be studied and explained by many different people many different ways.
A. Balloons can be filled with air.
C. Air has mass.
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The Earth is a sphere is a statement to describe a scientific law
Answer:
In an elastic collision, the momentum is conserved and the mechanical energy is conserved too.
Explanation:
There are two types of collisions:
- Elastic collision: in an elastic collision, the total momentum before and after the collision is conserved; also, the total mechanical energy before and after the collision is conserved.
- Inelastic collision: in an inelastic collision, the total momentum before and after the colllision is conserved, while the total mechanical energy is not conserved (in fact, part of the energy is converted into other forms of energy such that thermal energy, due to the presence of frictional forces)
