$A$ particle moves in space along the path $z = ax^3 + by^2$ in such a way that $\frac{dx}{dt} = c = \frac{dy}{dt}$,where $a, b,$ and $c$ are constants. The acceleration of the particle is:

  • A
    $(6ac^2x + 2bc^2) \, \widehat{k}$
  • B
    $(2ax^2 + 6by^2) \, \widehat{k}$
  • C
    $(4bc^2x + 3ac^2) \, \widehat{k}$
  • D
    $(bc^2x + 2by) \, \widehat{k}$

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