While waiting in a car at a stoplight, an 80 kg man and his car are suddenly accelerated to a speed of 5 m/s as the result of a rear end collision

B) as the temperature increases, the kinetic energy of the particles increases.|-/

It's because 3 if it was 10 it wouldn't look right do it goes up to 4d

Amagnetic field "does not" interact with stationary electric charges. so, a.hope my answer you : )

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