[填空题]
A 2.30-m-long pole is balall h,shm)4.vo nce,ted c1 ltev88it q+k5d 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 before it hits the ground? [Hint: Use cove+tq8 8t 1ed, cit5klnservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
