A Block Is Placed on a Rough Wooden Plane

Multiple Choice

A block is placed on a rough wooden plane.It is found that when the plane is tilted 30F° to the horizontal, the block will slide down at constant speed.The coefficient of kinetic friction of the block with the plane is:

A) 0.500
B) 0.577
C) 1.73
D) 0.866
E) 4.90