In everyday use and in kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.
近义、反义、联想词
近义词
n.
unskillfulness, pace, rate, stupidity
联想词
impatience急躁;lack缺乏;laziness怠惰;sluggish萧条的;annoyance烦恼;weakness弱点;speed加速,迅速前行;inconsistency矛盾;apathy冷漠,无兴趣,漠不关心;lag落后,滞后,缓慢移动 n. 相隔的时间;indifference不关心,不在乎;