Answer:
A
Explanation:
According to law of conservation of momentum, the total momentual in the system will be conserved
Sample:
As soon as the lightning is seen, sound travels in the air for several kilometers until it eventually reaches the observer.
Before a star is born, the matter that will become the star exists as a interstelar gas and dust. The stars are formed as a result of the forces:the force of gravity compresses atoms in the interstellar gas. Then the fusion reaction begins. During this fusion reaction the temperature gets extremely high and all the material evolves into a hot bright star.
Answer:
Medium
Explanation:
A mechanical wave moves through any medium, meaning any physical matter. A medium can be any state of matter, such as a liquid, gas or solid. An example of a mechanical wave is sound, which is the vibration of matter.