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

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The initial velocity of a particle is \( \mathrm{u}( \) at \( t=0) \) and the
P acceleration is given by \( f=a t \). Which of the following relations is valid?
W
(1) \( v=u+a t^{2} \)
(2) \( v=u+\frac{a t^{2}}{2} \)
(3) \( v=u+a t \)
(4) \( v=u \)
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