[填空题]
A 2.30-m-long pole is balanc+xorm 9lr 6bc qw,xo0;ed vertically on its qu-3 d,7iee mztip. It starts to fall and its lower end does not slip. What will be theide73 z,um-q e speed of the upper end of the pole just before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
