[填空题]
A 2.30-m-long pole is balanced vertically on its tip. It63kyqk t2puxi9kdz5 : starts to fall and ib/*)w(kaejt b ts lower end does not slip. What will be the speed of the upper end of th)(w */abkbjet e pole just before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
