[问答题]
If the coefficient of kinetis wg6 w8g3n;:wmiu3ic2hy.kkc friction betwe9 hb e12ijc7 ao1h6k6hur(t dien 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?
