A Tired Worker Pushes a Heavy 100-Kg) Crate That Is

Multiple Choice

A tired worker pushes a heavy 100-kg) crate that is resting on a thick pile carpet. The coefficients of static and kinetic friction are 0.6 and 0.4, respectively. The worker pushes with a horizontal force of 490 N. The frictional force exerted by the surface is

A) 980 N.
B) 588 N.
C) 490 N.
D) 392 N.
E) 100 N.