[填空题]
A 2.30-m-long pole is balanced d;gu:8 p (2eh ;xjowmqq-(tj lvertically on its tin (m+pq 5jvpx+efj) q.p. 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 conservation of energy.] fx5(qqvep++j. )pmjn $m/s$
Post time 2025-2-18 20:00:22
