A rocket is fired upwards. Its velocity versus time graph is shown in the figure-1.131. The maxi...

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A rocket is fired upwards. Its velocity versus time graph is shown in the figure-1.131. The maximum height reached by the rocket is :
Figure \( 1.131 \)
(A) \( 7.1 \mathrm{~km} \)
(B) \( 79.2 \mathrm{~km} \)
(C) \( 72 \mathrm{~km} \)
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