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【单选题】
作直线运动质点的运动方程为 x = t 3 - 40t ,从 t 1 到 t 2 时间间隔内,质点的平均速度为:( )
A.
( t 2 2 +t 1 t 2 +t 1 2 )-40
B.
3t 1 2 -40
C.
3(t 2 -t 1 ) 2 - 40
D.
(t 2 -t 1 ) 2 -40
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