[填空题]
A 2.30-m-long pole is balanc xz 4a)u81d; nxmjqmo*hacmfn, 320fced verti1e(;w ;lltff jf/k;,we y g-wically 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 pole lfk jwfi/we-;yet;(;lf 1w, gjust before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
