Question: Two people push from opposite sides on adjacent blocks that are placed on a rough floor: a 4 kg block on the left and an

Two people push from opposite sides on adjacent blocks that are placed on a rough floor: a 4kg block on the left and an 8 kg block on the right. Throughout this scenario the blocks stay in contact but are not glued together. Person 1 pushes down and to the right on the 4kg block with force at an angle above the horizontal. Person 2 pushes to the left on the 8kg block with a horizontal force .The blocks do not move. What must be the direction of the static friction acting on the two-block system?

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