A point moves in $x-y$ plane as per $x=kt,$ $y = kt\left( {1 - \alpha t} \right)$ where $k\,\& \,\alpha \,$ are $+ve$ constants. The equation of trajectory is 

  • A

    $y = x - \frac{{\alpha {x^2}}}{k}$

  • B

    $y = x + \frac{{\alpha {x^2}}}{k}$

  • C

    $x = y - \frac{{\alpha {y^2}}}{k}$

  • D

    $x = y - \frac{{\alpha {y^2}}}{k}$

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