[填空题]
A 2.30-m-long pole is balanced vertically on9 :h0eoi b-p1lj evw5i its tip. It sta9a36w l yq hvw/az*-mprts 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 grwy /mz*w6p9qva 3hl- aound? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
