Question

A force $(3\hat{i}+4\hat{j})$ newton acts on a body and displaced it by $(3\hat{i}+4\hat{j})$ metre. The work done by the force is :

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

Answer 1

Answer: (B)

25 J

$W=\int \overline{F}.\overline{d}s=\overline{F}.\overline{s}=+|3^2+4^2|=25J$

displacement and force same direction. +ve.