In the following graph,the velocity of an object as it moves along a horizontal straight line(水平直线)is plotted against time.(一个物体在水平直线上运动,其速度随时间的变化如图所示)
(1)The distance traveled by the object during the frist 6seconds in
meters.(物体在前6s内的位移是多少) (2)The average speed of the object during the first 8seconds is in meters per second