[填空题]
A 2.30-m-long pole is balanced verticallysg yw,c;j)y+p i vo7u8 on its tip. It starts j ;(y9o5trgj xto 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 conservtjjro(; g5 9xyation of energy.] $m/s$
Post time 2025-2-18 20:00:22
