MCQ
A force of $(3\hat i + 4\hat j)\, N$ acts on a body and displaces it by $(3\hat i + 4\hat j)\,m$ . The work done by the force is ............. $\mathrm{J}$
- A$10$
- B$12$
- C$16$
- ✓$25$
✓
Answer
Correct option: D.
$25$
d
Work done $W = \vec F.\vec d = (3\hat i + 4\hat j). (3\hat i + 4\hat j)$
$ = 9 + 16 = 25\, Joule$
Work done $W = \vec F.\vec d = (3\hat i + 4\hat j). (3\hat i + 4\hat j)$
$ = 9 + 16 = 25\, Joule$
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