Rebecca (F=40kg) is at the bus stop when her friends drive up. She can either sit in the front seat or the back seat. The front seat has a coefficient static friction of Us=0.50. The back seat has a coefficient static friction of Us=0.70.
If she sits in the front seat she has to hold her friends books (M=10kg).
If she wants to maximize her total static friction force possible, which seat should she take?
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