[填空题]
A 2.30-m-long pole is balanced vertically ofc.uxto z6.* 9im q+kun its tip. Itvao;e.6o4prwsxn.t s 1 2jfr(: vbhb; 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 ja6 seor4;bor .bvt:w nsphv 1x2.f(; hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
