A 6 kg rock rolls down a hill with a momentum of 12 kg m/s. Work out the velocity of the rock.

Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?

Motivation cannot be developed with practice; a person either possesses it or they do not.

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.