[填空题]
A 2.30-m-long pole is balanccr+z2 ,zgs an kzi:o..ed ver/ p( bmhtjd2x:tically on its tip. It starts to fall and its lower end does not slip. W : h/d2jpt(xmbhat will be the 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
