A particle of mass ' \( m \) ' is moving in time ' \( t \) ' on a t...

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A particle of mass ' \( m \) ' is moving in time ' \( t \) ' on a trajectory given by
\( \mathrm{P} \)
\[
\vec{r}=10 \alpha t^{2} \hat{i}+5 \beta(t-5) \hat{j}
\]
W
Where \( \alpha \) and \( \beta \) are dimensional constants.
\( \theta \)
The angular momentum of the particle becomes the
same as it was for \( t=0 \) at time \( t= \) seconds.
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