A particle is situated at \( x=3 \) units at \( t=0 \). It starts moving from rest with a consta...

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A particle is situated at \( x=3 \) units at \( t=0 \). It starts moving from rest with a constant acceleration of \( 4 \mathrm{~ms}^{-2} \). The position of the particle at \( t=3 \mathrm{~s} \) is
(a) \( x=+21 \) units
(b) \( x=+18 \) units
(c) \( x=-21 \) units
(d) None of these
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