问题:
[单选题]
Aat=−4.84×10−4m/s2;f=4.84×10−3N
Bat=4.84×10−6m/s2;f=4.84×10−3N
Cat=−4.84×10−4m/s2;f=4.84×103N
Dat=−8.84×10−4m/s2;f=4.84×10−3N
Aat=−4.84×10−4m/s2;f=4.84×10−3N
Bat=4.84×10−6m/s2;f=4.84×10−3N
Cat=−4.84×10−4m/s2;f=4.84×103N
Dat=−8.84×10−4m/s2;f=4.84×10−3N
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