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

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The initial velocity of a particle is \( u \) (at \( t=0 \) ) and
P the acceleration is given by \( f= \) at. Which of the

W following relations is valid?
(1) \( 2 v=u+a t^{2} \)
(2) \( v=2 u+a t \)
(3) \( v=u+\frac{a t^{2}}{2} \)
(4) None of these
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