质点做直线运动的v-t图像如图所示,规定向右为正方向,则该质点在

质点做直线运动的v-t图像如图所示,规定向右为正方向,则该质点在前8s内平均速度的大小和方向分别为

A0.25m/s  向右

B0.25m/s  向左

C1m/s    向右

D1m/s    向左

答案

B

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