[问答题]
If the coefficient of ks6 my.r:s mlq6inetic fricc+9q 0 yltyc4rnq0ur: tion between 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?
