[填空题]
A 2.30-m-long pole is balc4s(b8l v2 v, jfz*gxnanced verto pirz r;17i;iically on its tip. It starts to fall and its lower end does not slip. What will be the speed ofriiz;; 7roi1p 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
