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12
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t
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v
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4
6
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8
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7
11
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9
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10
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8
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6
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v
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x
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A
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3 m/s
B
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1.2 m/s
2
C
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6 m
D
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3 s
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2
s
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x
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1
2
at
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1
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3
s
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x
2
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1
2
at
2
2
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3
s
鍐呬綅绉?/p>
x
3