[填空题]
A 2.30-m-long pole is balanced ver) iv qyiw*3c9 e5idaofrs+ 9*cta,tywc/su+q t82 v5u uically 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 twc+v5 u2/ 8uauty,s qpole just before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
