[填空题]
A 2.30-m-long pole is balanced vertically on its tip. It starts to fallx )(ipf 2l0jpz,w9fqi 1xe.kreih-b2 and its lower eiek1xr.e 2bh -nd 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.] $m/s$
Post time 2025-2-18 20:00:22
