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

question 28

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.