[填空题]
A 2.30-m-long pole isr6x. upm: e it+zkxu91xx85yxmbku 4;zqv84kw2)j 61yklo ky balanced vertically on its tip. It 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 hits the gro; kb)kvmyw8o qy k l2zkuj4614und? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
