[填空题]
If there were no air resistance, hn7g qu*sv6f(s,c:g cskzo )7qow long would it take a ql*4c1w ,nfabfree-falling parachutist to fall from a plane at 2400 m to an altitude of 350 m, where she will pull her ripcord? What would her wb14n q*cf,al speed be at 350 m? (In reality, the air resistance will restrict her speed to perhaps must lower value) $m/s$
