[填空题]
A 2.30-m-long pole imip9:t un4l- q+ zsf2c pxz(kkbsd+ gh71y81rs balanced vertically on its tip. It starts to fall and its lower end does not slip. What will be the 18 rps(d +ckz1skg7zbxh2fy+ 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
