[填空题]
A 2.30-m-long pole is balanced r a;pohe/r,gu qwx 0xo9y(jm/;ol +z,verticjiuy tfz9:(:l mqv+d0er;;qyally on its tip. It starts to fall and its loweriyyr;fq90d z:ml;uv (+:tjeq end does not slip. What will be the 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
