Q 11-05-034NEETJEE MainEasy
A force $F = (4 + 6x)$ N acts along the $x$-axis on a body. The work done by it as the body moves from $x = 1$ m to $x = 3$ m is
Answer: (A) $32$ J
Concept. $W = \displaystyle\int F\,dx$.
Step 1. Integrate. $\Big[4x + 3x^2\Big]_1^3 = 39 - 7 = 32$ J.
Answer. $32$ J (Option A).
Solution by Sreeraj P, M.Sc Physics