[填空题]
A 2.30-m-long pole is balabz.tv- r 8sd9:)zm*i5mqpv alnce:1rt riis(yovyr 5, b t34imk5d vertically on its tip. It starts to fall and its lower end does not slip. What will be the speed of the upper end of the pole just bt3(imir v5 :si1ro,br5y t yk4efore it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
