A car came to a stop from a speed of 16 m/s in a time of 2.3 seconds. What was the acceleration of the car?
O A. -9.80 m/s2
B. -4.12 m/s2
C. -6.96 m/s2
D. -13.7 m/s2

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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