[填空题]
A 2.30-m-long pole is bq 09u6l* uwcp9 urb4j.mbac3walanced vertically on its tip. It starts to t:m;jedbix3)d8s/y b fall and its lower end does not slip. What will be tid);yxsm8d/b :betj 3 he 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
