An experiment on the take-off performance of an aeroplane shows that the acceleration varies as ...

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An experiment on the take-off performance of an aeroplane shows that the acceleration varies as shown in the figure-1.133, and that it takes \( 12 \mathrm{~s} \) to take off from a rest position. The distance along the runway covered by the aeroplane is :
Figure \( 1.133 \)
(A) \( 210 \mathrm{~m} \)
(B) \( 2100 \mathrm{~m} \)
(C) \( 21000 \mathrm{~m} \)
(D) \( 1200 \mathrm{~m} \)
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