A magpie flying at a constant velocity of 7.50m/s foward and is carrying a 0.165kg sandwich at a height of 27.0m above the ground the total mechanical energy of the sandwich is

One splits the atoms and molecules  the other combines them

When someone eats food

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other