[填空题]
A 2.30-m-long pole is (pk9hdtrvu j7.,kqp: balanced vertically on its tip. It starts to fall an( --hbexsoo ;gd its lower end does not slip. What will be the- o-(hx sgob;e 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
