Which statement best explains the symbol [nacl]?

moles of water per liter of nacl
moles of water per liter of solution
moles of nacl per liter of solution
moles of nacl per liter of water

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.