A 13,500 kg railroad freight car travels on a level track at a velocity of 4.5 m/s. It collides and couples with (sticks to) a 25,000 kg second car, initially at rest ( which means its not moving, v = 0 m/s) and with brakes released. What is the velocity of the two cars after their inelastic collision?

the bedroo..

answer; i believe the correct answer to the above question is ( friction)

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.