Answer
$15000\dfrac {cm^{3}}{s}$
Work Step by Step
$V=x^{3}\Rightarrow \dfrac {dV}{dt}=3x^{2}\dfrac {dx}{dt}=3\times \left( 50cm\right) ^{2}\times 2\dfrac {cm}{s}=15000\dfrac {cm^{3}}{s}$
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