[填空题]
A 2.30-m-long pole is balanced vertically .dydshn9h-xr 7pxs-)on its tip. It starsd/zb7)v:hb lts to fall and its lower end does not slip. What will be the speed of the upper end of the pole just:d hb/bzvs )7l before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
