Blocks A and B of masses 10 kg and 7 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown. The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively
External forces P and Q act on block B, as shown. In Figure 5.20, force P equals 28 N. The maximum value of force Q, for which the system remains at rest is closest to: A) 140 N
B) 120 N
C) 98 N
D) 110 N
E) 130 N
A
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