The position vector of particle changes with time according to the relation \( \mathbf{r}(t)=15 ...

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The position vector of particle changes with time according to the relation \( \mathbf{r}(t)=15 t^{2} \hat{\mathbf{i}}+\left(4-20 t^{2}\right) \hat{\mathbf{j}} \).
What is the magnitude of the acceleration (in \( \mathrm{ms}^{-2} \) ) at \( t=1 \) ?
(a) 50
(b) 100
(c) 25
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