Answer:
The concentration of a chemical substance expresses the amount of a substance present in a mixture.
Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration is usually expressed in terms of mass per unit volume.
Answer:
The answer is "0.82 c".
Explanation:
Given:
Spacecraft speed 1 is
Space velocity 2 relative to spacecraft 1 is
The spacecraft velocity 2 measured by the Earth observation