[填空题]
A 2.30-m-long pole is balanced vertically onu)uc+:a e8tcstfp . 7d its tip. It starts to fall2e b8m bwu5+2z8)*s daao xgjo and its lower end does not slipdeaag*2w+osz u28 o85bm ) jbx. What will be the speed of the 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
