[填空题]
A 2.30-m-long pole is balanced vertically on i dq;u,zs1 e:z(jftbt7 pcs;q.3/a:p v+yl:wq/g ii/cr qlap,c)u. kkts 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 conservation of/:cs3/kg i;vqai cp) .acpl,y:q qp+r /.lkwu energy.] $m/s$
Post time 2025-2-18 20:00:22
