A particle starts from rest at \( t=0 \) and moves in a straight line with acceleration as shown...

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A particle starts from rest at \( t=0 \) and moves in a straight line with acceleration as shown below. The velocity of the particle at \( t=3 \mathrm{~s} \) is
[Kerala PET 2008]
(a) \( 2 \mathrm{~ms}^{-1} \)
(b) \( 4 \mathrm{~ms}^{-1} \)
(c) \( 6 \mathrm{~ms}^{-1} \)
(d) \( 8 \mathrm{~ms}^{-1} \)
(e) \( 1 \mathrm{~ms}^{-1} \)
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