The velocity-time graph of a particle moving in a straight line is shown in figure. The accelera...

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The velocity-time graph of a particle moving in a straight line is shown in figure. The acceleration of the particle at \( t \) \( =9 \mathrm{~s} \) is
(1) Zero
(2) \( 5 \mathrm{~ms}^{-2} \)
(3) \( -5 \mathrm{~ms}^{-2} \)
(4) \( -2 \mathrm{~ms}^{-2} \)
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