单选题: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 A.0.25m/s向

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题目内容:
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

A.0.25m/s向右
B.0.25m/s向左
C.1m/s向右
D.1m/s向左
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