Question

A force $(3\hat{i}+2\hat{j})$ N displaces an object through a distance $(2\hat{i}+3\hat{j})$ m. The work done will be:

• A. 15 J
• B. 11 J
• C. 4 J
• D. zero J

Answer 1

Answer: (D)

Work done is given by $W=\overrightarrow{F}\times \overrightarrow{s}=(3\hat{i}+2\hat{j}).(2i-3j)$ $=6-6=0J$