A particle moving along $x-$axis has acceleration $f$, at time $t$ , given by $ f=f_0$$\left( {1 - \frac{t}{T}} \right)$, where $f_0$ and $T$ are constants. The particle at $t=0$ has zero velocity . In the time interval between $t=0$ and the instant when $f=0$ , the particle 's velocity $(v_x)$ is 

  • [AIPMT 2007]
  • A
    $\frac{1}{2}{f_0}{t^2}$
  • B
    $\;{f_0}{T^2}$
  • C
    $\;\frac{1}{2}{f_0}T$
  • D
    $\;{f_0}T$

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