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【单选题】
质点沿x 轴正向运动,其加速度随位置的变化关系为 。如在x=0 处,速度υ0 =5 m/s ,那么,x =3 m 处的速度为( )m/s.
A.
9
B.
10
C.
7.8
D.
8
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A.
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B.
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A.
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C.
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