The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.
A. 6.0 N
B. 5.1 N
C. 5.5 N
D. 4.6 N
E. 3.7 N
Answer: D
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