[填空题]
If there were no air0k 5hduvqba94bmv:6 tj9d( th r1y e2 vw0mfn/mesistance, how long would it take a free-falling parachutist to fall from a plane a2ynv / f0ew1mmt 2400 m to an altitude of 350 m, where she will pull her ripcord? What would her speed be at 350 m? (In reality, the air resistance will restrict her speed to perhaps must lower value) $m/s$
