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最佳答案：初速度为零时，V²=2aS。式中a是加速度，S是速度从0匀加速变成V期间物体运动的距离。初速度为零时，物体受力作匀加速运动，经t秒后速度达到V,期间最佳答案：中兴通信，波导股份（现在好像不做手机了）