A 4 kg box is next to a 2 kg box on a rough horizontal surface. The coefficient of static friction is 0.3 and coefficient of kinetic friction is 0.2. a) What minimum horizontal force is needed to be applied to the 4 kg box in order to start to move both boxes horizontally? b) What is the acceleration of the boxes when they are moving by this force? c) Find the contact force between the boxes.

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: