[填空题]
A 2.30-m-long pole is ballzo a6xu.vgk *(m+ 8csanc 3w r*qk9v;cgjed 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 ground? [Hint: Use conservvc 3qw k*r;jg9ation of energy.] $m/s$
Post time 2025-2-18 20:00:22
