[填空题]
A 2.30-m-long pole is6u9x.;lq3z p m:ctrhg f/+zgz bala crvv6nun2+ h k)rw.(pnced vertically on its tip. It starts to fall and its lower end does not slip. What will be the speenuv)prkv + c6h2n.r(wd of the upper end of the pole just before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
