[填空题]
A 2.30-m-long pole is bala apz68w 0umcd1n2ml.vk :2srt hced vertically on its tip. It starts to fall and its lower end does not slip. What will be the speed of thv:2 h lkr2mts.e 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
