As Shown in the Figure, Block B on a Horizontal

As shown in the figure, block B on a horizontal tabletop is attached by very light horizontal strings to two hanging blocks, A and C. The pulleys are ideal, and the coefficient of kinetic friction between block B and the tabletop is 0.100. The masses of the three blocks are m_A = 12.0 kg, m_B = 7.00 kg, and m_C = 10.0 kg. Find the magnitude and direction of the acceleration of block B after the system is gently released and has begun to move.

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0.44 m/s², ...

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