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当以速度v≥(gR)~(1/2)通过桥顶时汽车会飞离桥面,会不会又落到桥面上?关于这一问题,给出两种证明方法,体会证明二中所用方法的严谨性。
When the speed v ≥ (gR) ~ (1/2) through the top of the bridge when the car will fly off the bridge, will not fall to the bridge again? On this issue, given two proofs, experience proved that two The rigor of the method used.