[填空题]
A 2.30-m-long pole is gq0e*7if,r1s ,dvbkmbala,eu ad4g+a*xnnced 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 grx*+4angu da,e ound? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
