Question

Gravitational field in a region is given by $(3\hat{i}+2\hat{j})Nk{g}^{-1}$. Find the work done by the gravitational field when a particle of mass m moves from one point $(x_1,y_1)$ to another $(x_2,y_2)$ one the line $2y+3x=5$

• A. zero
• B. $9(x_2-x_1)+4(y_2-y_1)$
• C. $9(x_1-x_1)+4(y_1-y_2)$
• D. none

Answer 1

The correct option is A zero

Direction of displacement and gravitational field (so as gravitational force) are at right angle to each other, as the product of their slope is equal to $-1$

Therefore work done is zero.