[填空题]
A 2.30-m-long pole is balanced scf )y/) 6jqhmvertically *xiftsw d21 3ion its tip. It starts to fall and its lower end does not slip. What will be the fs*x ii23t1dw 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
