[填空题]
A 3800-kg open railroad car coasts along witbc6ngrz k gh nog6n:, hz6719rh a constant /1 hg6wvi,mibspeed of 8.6m/s on a level track. Snow begins to fall vertically ivbimg/6 ,wh1and fills the car at a rate of 3.5kg/min Ignoring friction with the tracks, what is the speed of the car after 90.0 min?$\approx$ m/s