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【单选题】
用30 N的水平外力 F 拉一个静止放在光滑水平面上的质量为20 kg的物体,力 F 作用3s后消失.则第5s末物体的速度和加速度分别是( )A.
v＝4.5 m/s，a＝1.5 m/s 2
B.
v＝7.5 m/s，a＝1.5 m/s 2
C.
v＝4.5 m/s，a＝0
D.
v＝7.5 m/s，a＝0
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【单选题】It must be his mistake,___? A.mustn't it B.hasn't it C.needn't it D.isn't it
A.
mustn't it
B.
hasn't it
C.
needn't it
D.
isn't it
【单选题】It is going to be fine tomorrow. ____. A. So is it B. So it is C. So it does D. So does it
A.
So is it
B.
So it is
C.
So it does
D.
So does it
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