At any instant the velocity of a particle of mass 500 g is $\left(2 t \hat{\mathrm{i}}+3 t^2 \hat{\mathrm{j}}\right) \mathrm{ms}^{-1}$. If the force acting on the particle at $t=1 s(\hat{i}+x \hat{j}) N$. Then the value of $x$ will be-
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