Question

A body of mass of $4\;kg$ experiences two forces $\vec{F_1}=5\hat i+8\hat j+7\hat k$ and $\vec{F_2}=3\hat i-4\hat j-3\hat k$ then acceleration acting on the body $R$

Answer 1

The correct answer is : $\sqrt6$
$\vec{a}=\frac{\vec{F}_{net}}{M}=\frac{8\hat{i}+4\hat{j}+4\hat{k}}{4}$
$=2\hat{i}+\hat{j}+\hat{k}$
$a=\sqrt{4+1+1}$
$=\sqrt6\ m/s^2$