[填空题]
A 2.30-m-long pole is b+7c hz,re8og4bcc+ idalan9k1nlt-p 1kowced vertically on its tip. It starts to fall and its lower end does not slip. What will be the speed of the upper end of the pole just before it hits the ground? [Hint: Usepont kw11lk-9 conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
