[填空题]
A 2.30-m-long pole is balanced vertic7 w-na +i 7h*ny9w*plo*f solually on its tip. It starts to fall and its 9/ucq e/wmc-((ob dlrg8 di1a lower end does not slip. What will be the speed of the upper end of the pole juoi (l/m/r(9u8dceb q- cg1d wast before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
