Question

A stockroom worker pushes a small crate with a mass of 9.40 kg on a horizontal

surface at constant speed. The coefficient of kinetic friction between the crate and

the surface is 0.20. What horizontal force is required to maintain the motion?

Answer 1

$$F=F_f=\mu N=\mu mg\\ =0.20*9.40*9.8=18.4\;\rm N$$