A 400-N Block Is Dragged Along a Horizontal Surface by an Applied

Multiple Choice

A 400-N block is dragged along a horizontal surface by an applied force as shown. The coefficient of kinetic friction is u_k = 0.4 and the block moves at constant velocity. The magnitude of is:

A) 100 N
B) 150 N
C) 200 N
D) 290 N
E) 400 N