[填空题]
A 2.30-m-long pole is balanced vertically on its tip. It startsdds-r 4 3q*ra*2jfwlt tn* vxbui3x)2rw)-f7 / wzp ndqo fall and its lower end dowb3xu)pvfxw z7r/ 2 qn)i*d-nes 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
