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汽车转弯：向心力 \vec F_c = m \vec a_c 指向中心。1.000 kg 以 60 km/h 在半径 100m 的弯道：
汽车转弯：向心力 \vec F_c = m \vec a_c 指向中心。1.000 kg 以 60 km/h 在半径 100m 的弯道：
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