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Problem 11. A block of mass M = 10 kg is subjected to a force F as shown. The box/horizontal surface interface is described by µs = 0.5 and Hk

= 0.25. (a) If F = 30 N, determine |ā|. (b) If F = 90 N, determine |ā|. (c) Make a qualitatively correct graph of |ā| versus F.

Fig: 1

Fig: 2