The graph shown was obtained from experimental measurements of the period of oscillations $T$ for different masses $M$ placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the
If we draw a graph between ${T^2}$ and $M$ then it will be straight line.
and for $M = 0, T^2 = 0$
i.e. the graph should pass through the origin.but from the it is not reflected it means the mass of pan was neglected.
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