[填空题]
A 110-kg crate, starting from rest, is pulled across a floofj 68dc3,2suvn r xg8dr with a consrf -qa.f8l7wq ek:x4p tant horizontal force of 350 N. For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of fr4frpx q7:k8- ae f.lwqiction is 0.30. What is the final speed of the crate? m/s
