Question

A body is acted upon by a force $F=\hat{i}+2\hat{j}+3\hat{k}$ . The work done by the force in displacing it from $(0,0,0)$ to $(0,0,4m)$ will be -

• A. $12J$
• B. $10J$
• C. $8J$
• D. $6J$

Answer 1

Answer: (A)

$12J$

We know that the work done is given as

$work=force\times displacement$

$W=F.d$

By substituting the values we get

$W=\left(i+2j+3k\right)\cdot \left(4k\right)$

$W=12J$