[填空题]
A 2.30-m-long pole is balanced vertically on its tip. It starts to n 2k0ty kmqqme:(xc() fljtn hq+61.ll2 yizc5qaso(5all and its lower end does not slip. What will be the speed of the upper end of the pole just b+5nsl 6 t12ach 5ylqjl. oq(izefore it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
