1. A marble has a mass of 0.02 kg and is rolling across the floor with a velocity of 2 m/s. What is the momentum of the marble?

amber has allowed scientists to study dna that has been preserved over millions of years.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.