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- 质量为m的质点,在有阻力的水平地面运动。设所受的牵引力F与速度呈正比,比例系数为k,已知阻力与重力成正比,且比例系数为u,研究其运动-Mass m particle resistance level of ground motion. Set suffered the traction F with speed proportional to the proportionality coefficient k, known resistance is proportional to the gr