All of Newton's laws of motion
GOT
A 50-kg object is accelerating to the right at 10 m/s. What is the magnitude of the rightward net force acting
on it in Newtons)?
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Newtons
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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