[填空题]
A 2.30-m-long pole is balanced v8 :v:a6 jv d6wu), .u/fslpphw 1mziytertically on itmnirk n//-t7,sv z rt7s 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: Use conservationnntstm 7k v/-7/i,zrr of energy.] $m/s$
Post time 2025-2-18 20:00:22
