[填空题]
A 2.30-m-long pole is balanct(5)vlurs2 aevb +-b:h qypvzu8gt +yls0)x .ewy5;kee)x:f tahw:il *mh4+b d vertically on its tip. It starts to fall and its lower end does not slip. What will be the speed of the ufe *kya4; l )hbi+mt5::hwxe wpper 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
