# 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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