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A body is moving according to the equation $x=a t+b t^2-c t^3$ where $x=$ displacement and ${ }^{a, b}$ and $c$ are constants. The acceleration of the body is
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The correct answer is:
$2 b-6 c t$
$x=a t+b t^2-c t^3, a=\frac{d^2 x}{d t^2}=2 b-6 c t$
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