A Block with a Mass of 10 Kg Is at Rest

Multiple Choice

A block with a mass of 10 kg is at rest on a horizontal surface.The coefficient of static friction between the block and the surface is 0.30,and the coefficient of kinetic friction is 0.25.A force of 20 N acts on the block toward the left.The magnitude of the frictional force on the block is

A) 10 N
B) 20 N
C) 0.10 kN
D) 30 N
E) 3.0 N