[填空题]
A 2.30-m-long pole is balanced vertically on i5ah;vza5 jaei;51f.k+o90ops mjmb xts.p3k dbt;-cz .+izzks tip. It starts to fall and its lower end does not slip. What will be the speed of the upper en.t+sp z-bdi ;z kzk3c.d of the pole just before it hits the ground? [Hint: Use conservation of energy.] $m/s$
Post time 2025-2-18 20:00:22
