[填空题]
A 2.30-m-long pole i ek-/t)/c fprc9a;uabs balanced if :0h,nef n,uzq ;49xd 6y(pn knu4auvertically 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 justu,4 u qnzef9n (d:4yphaun k60x,if n; before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
