Two blocks of mass m1 and m2 slide along a horizontal surface.
An external force F applied to m1 from the left provides enough acceleration to keep m2 from sliding down the face of m1. The coeﬃcient of kinetic friction between m1 and the horizontal surface is µk. The coeﬃcient of static friction between m1 and m2 is µs, and µs > µk. What is the smallest value of F required to keep m2 from slipping?
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