A basic assumption concerning source motion is to consider it to be of constant velocity with random perturbations over the observation intervals.
目标运动的基本假设是在一段观测时间中保持常速度，并有随机速度扰动。
Is the motion with even variable velocity the result of constant force?
匀变速运动是恒力作用的结果吗？
Is the motion with even variable velocity the result of constant force?
匀变速运动是恒力作用的结果吗？
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