[填空题]
A 2.30-m-long pole ieq /x ytwd.0w)s balanced vertic c2kxq*(jyg.cz )o 5vbally on its tip. It starts to fall and its lower end does not slip. What will be t)2qk z*y.cv5 ox bcgj(he 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
