[填空题]
A 3800-kg open railroad car coasts along with a constant speed of 8.6m/lpc7j l szg50fqk7ntm7s10z7 s on a lef7ts 7757p0 nmc1zlklg0js q z4c rba. sq-eufnd/*7lvel track. Snow begins to fall rase7 ul .n*4fb-d/qcvertically and 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
