[填空题]
A 2.30-m-long pole idm bki 6lh- )o7kb+*c0fdsw-cs balanced vertically on its tip. It starts to fall and rtg jd0dxe;wtq v86s g(h8 bey18ed61its lower end does not slip. Why xg1 wqb8r108th;gs dvdd jee6(6e8tat 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
