Question

A force $(3\hat{i}+4\hat{j})N$ acts on a body and displaces it by $(3\hat{i}+4\hat{j})$ meters. The work done by the force is
(Given that formula for work done is $W=\overrightarrow{F}.\overrightarrow{s})$

• A. $5J$
• B. $25J$
• C. $10J$
• D. $30J$

Answer 1

The correct option is B $25J$

Work done = $\overrightarrow{F}.\overrightarrow{s}$
$=(3\hat{i}+4\hat{j}).(3\hat{i}+4\hat{j})=9+16=25J$