The Three Blocks Shown Are Released from Rest and Are

Multiple Choice

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