The positions of two cars $A$ and $B$ are given by $X_A = at + bt^2$ and $X_B = ft - t^2$. At what time will both cars have the same velocity?

  • A
    $\frac{a+f}{2(1+b)}$
  • B
    $\frac{f-a}{2(1+b)}$
  • C
    $\frac{a-f}{1+b}$
  • D
    $\frac{a+f}{2(b-1)}$

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$Assertion$ : Velocity-time graph for an object in uniform motion along a straight path is a straight line parallel to the time axis.
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