A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block.
A. 4.2 N
B. 3.0 N
C. 3.4 N
D. 3.8 N
E. 2.3 N
Answer: C
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