The initial velocity of a particle (at \( t=0 \) ) is \( u \) and \...

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The initial velocity of a particle (at \( t=0 \) ) is \( u \) and
\( \mathrm{P} \) the acceleration of particle at time \( t \) is given by \( f= \) \( a t \), where \( a \) is a constant. Which of the following
W relation for velocity \( v \) of particle after time \( t \) is true?
(1) \( v=u+a t^{2} \)
(2) \( v=u+a t^{2} / 2 \)
(3) \( v=u+a t \)
(4) None of these
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