[填空题]
A 2.30-m-long pole is balav2gy f9/**uxrk9 eech ;i+tin nced vertically on its tip. It starts to fall ak +r x4(6tckz-9zftwend its lower end does not slip. What will be the speed of the upper end of tzt+- ct6 z49 kkwfe(rxhe pole just before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
