[问答题]
If the coefficient of kineticj g as) um;wvkbj34 owezh3,9, friction between uq3ex 7hxu4l5 a 35$-\mathrm{kg}$ crate and the floor is 0.30 , what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required if $\mu_{\mathrm{k}}$ is zero?
