[填空题]
A 110-kg crate, starting fbn2b(md1aw5/1s yvf srom rest;z +) me hrit;12nam6jxl-byz, 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. Whn6m;2 m;x1rye a)thb jl i+-zzat is the final speed of the crate? m/s