[填空题]
A 12,600-kg railroadf( wmoh-;)mz)- vrfz7)dygoe ca6pjog 7et.n4 ar travels alone on alevel frictionless track with a constant speed of 18m/s A 5350-kg lot7a. p n4goje6ad,initially at rest, is dropped onto the car. What will be the car’s new speed? m/s
