In the figure shown, mass m1 = 12.9 kg, m2 = 11.8 kg, and the surfaces are all frictionless. How much force would be required to accelerate the masses so that the top mass moves with acceleration 8.8 m/s2? Give your answer in N

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.