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

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Counter-Strike: Source
Game:
Counter-Strike: Source (2004)
Duration: 2:38
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The position vector of a particle changes with time according to the relation \( \vec{r}(t)=15 t^{2} \hat{i}+\left(4-20 t^{2}\right) \hat{j} \). What is the magnitude of the acceleration at \( t=1 \) ?
(a) 40
(b) 100
(c) 25
(d) 50
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