[填空题]
A 2.30-m-long pole is balan4pl ) 7qoa hvxb:*6lt2ht7 vwnced vertically t*6:yyace + xron its tip. It starts to fall and its lower end does not slip. What will be the speed of the upper end of th: yex a6+ry*cte pole just before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
