Two identical boxes with mass 10kg sit on the horizontal floor of a truck. There is friction between one of the boxes and the floor, and no friction between the other box and the floor. The two boxes are tied together with a massless string. The truck begins to slow down with acceleration -3.75 m/s2.
If neither block slides, how large a coefficient of static friction must there be between the floor and the one box on the left (the one with the force of friction)?
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