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Problem 4 (25 pts) Block B in figure (right) has the mass of 50 kg. The Knot coefficient of static friction between the block and the table is 0.25; an angle 0 is 30; assume that the cord B between B and the knot is horizontal. Find the maximum mass of block A (kg, round to 1 decimal place), for which the system will be A stationary. Assume g = 9.8 m/s