[填空题]
A 2.30-m-long pole is balanced vervb+* j) hoill9gbh53hbuh0.x6yt3 ko:p gb;tq0 :xlotically on its tip. It starts to fall and its lower end does notgx0b:ql:op; t slip. What will be the speed 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
