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$A$ body of mass $5 \,kg$ is moving with a velocity of $\vec{v}=(2 \hat{i}+6 \hat{j}) \,m/s$ at $t=0 \,s$. After time $t=2 \,s$,the velocity of the body is $(10 \hat{i}+6 \hat{j}) \,m/s$. The change in momentum of the body is ......... $kg \cdot m/s$.
- A$40 \hat{i}$
- B$20 \hat{i}$
- C$30 \hat{i}$
- D$(50 \hat{i}+30 \hat{j})$
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