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Potential energy (V) versus distance (x) is given by the graph. Rank various regions as per the magnitudes of the force (F) acting on a particle from high lo low.
$$F=-\frac{dV\left(x\right)}{dx}=-slope$$
$$F_{AB}=-\frac{1}{1}=-1\ N$$
$$F_{BC}=-\frac{4-1}{2-1}=-3\ N$$
$$F_{CD}=-\frac{4-4}{4-2}=0\ N$$
$$F_{DE}=-\ \frac{3-4}{6-4}=0.5\ N$$
$$\therefore\ $$ $$F_{BC}>F_{AB}>F_{DE}>F_{CD}$$
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