In figure, displacement-time \( (x-t) \) graph given below, the average velocity between time \(...

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In figure, displacement-time \( (x-t) \) graph given below,
the average velocity between time \( t=5 \mathrm{~s} \) and \( t=7 \mathrm{~s} \) is
(a) \( 8 \mathrm{~ms}^{-1} \)
(b) \( 8.7 \mathrm{~ms}^{-1} \)
(c) \( 7.8 \mathrm{~ms}^{-1} \)
(d) \( 13.7 \mathrm{~ms}^{-1} \)
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