A 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 600 N. Use g = 9.8 m/s2. The frictional force exerted by the surface is
A) 980 N.
B) 588 N.
C) 490 N.
D) 392 N.
E) 98 N.
Correct Answer:
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