[填空题]
A 110-kg crate, starting frnp4icq d 3gnv(g+; / ikrd2jy6om .kx qti/7: nf;r)j wm pcmw1;nrest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of friction is 0.30. What krp jwm)1mxwcn;/t.qf7; n: iis the final speed of the crate? m/s
