[填空题]
A 2.30-m-long pole is bal(i 5sxe;x k,9mgllg7 0bi bl*xanced vertically on its tip. It starts t.o 7g qtfjo4u -s6(s,fb widg:o fall and its lower end does not slip. What will be the speed of the upper end of the pole just before it hitsdb.s,wt 7:4jquf- s6(og gio f the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
