[填空题]
A 2.30-m-long pole is balanc2./e)q ibscc.h29vprsj( +hso(oq c qed vertically on its tip. It starts to fall antf:dd-j t29sqq0pk +m2l ohb8 d its lower end does not slip. What will be the speed of the upper end of the pole just before it hits the grounqlo+ km2f-d8t2bsq hdp:09 jtd? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
