2. After you cross the finish line, you slow
down and come to a stop, breathing hard. It
takes you 10 seconds to come to a stop.
What is your acceleration?

Sorry i don’t know what to do

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