C. isotope
Isotopes have the same atomic number but different mass number because of the difference in the number of neutrons in the nucleus of the atom.
That gives you the magnitude of velocity, but it doesn't handle
the directions that are involved.
Sometimes if you have the word per, you need to multiply. In this problem, they are asking you to find the amount of meters a snail can travel per minute.They are giving you the amount of minutes, so in this case you multiply 15 times 0.30. The answer is 4.5 meters.
