A 18-Kg Block Is Released from Rest at the Top of of a Rough

Multiple Choice

A 1.8-kg block is released from rest at the top of a rough 30 $\degree$ 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