Q 11-03-023NEETJEE MainEasy
A force $\vec{F} = (2\hat{i} + 3\hat{j} - \hat{k})$ N moves a particle from the point $(1, 2, 0)$ m to the point $(4, -1, 3)$ m. The work done by the force is
Answer: (D) $-6$ J
Concept. Work by a constant force: $W = \vec F \cdot \vec s$.
Step 1. Displacement. $\vec s = 3\hat i - 3\hat j + 3\hat k$.
Step 2. Work. $6 - 9 - 3 = -6$ J.
Answer. $-6$ J (Option D).
Solution by Sreeraj P, M.Sc Physics