If $\vec{F}$ and $\vec{S}$ are force and displacement respectively,and the work done by them is zero,then:

  • A
    $\vec{F}$ and $\vec{S}$ are in opposite directions.
  • B
    $\vec{F}$ and $\vec{S}$ are in the same direction.
  • C
    $\vec{F}$ and $\vec{S}$ are mutually perpendicular.
  • D
    $\vec{F}$ is greater than $\vec{S}$.

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$A$ particle moves from position $\vec{r}_1 = 3\hat{i} + 2\hat{j} - 6\hat{k}$ to position $\vec{r}_2 = 14\hat{i} + 13\hat{j} + 9\hat{k}$ under the action of force $\vec{F} = 4\hat{i} + \hat{j} + 3\hat{k} \text{ N}$. The work done will be ............ $\text{J}$.

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