Dot product

If velocity and position vectors of an object are given by: \[\vec{v}=(3\hat i+\hat j)\dfrac{m}{s}\] \[\vec r=(4\hat i)m\] \[m=2 kg\] Find the magnitude of its angular momentum, \(L\), in units of \(\si{\kilo\gram\meter\squared\per\second}\).

Hint: Use \(L=m(\vec{v} \times \vec{r})\).

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