[填空题]
A 2.30-m-long pole is balanced vert3phiqj:rd ,k3ically on itf*d f:iz:b j(os tip. It starts to fall and its lower end does not slip. What will be the speed of the :izfb odjf:*(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
