一个质量为0.5kg的物体,从静止开始做直线运动,物体所受合外力F随

一个质量为0.5kg的物体,从静止开始做直线运动,物体所受合外力F随时间t变化的图象如图所示,则在时刻t=8s时,物体的速度为
A.2m/s             B.8m/s 
  C.16m/s                               D.

答案

C

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