Dear Jitin,

As you know gravitational force on any object is given as , F = mg , so it seems that the heavier mass i.e. the block of mass m that you kept is going to be pulled with strong force than the light spring. But the point is what accelarations do both the masses have, depending on that we can say which one is going faster.

consider spring having mass , m1,

force on it is, F1 = m1Xg => accelaration of the spring downwards = F1/m1 = m1Xg/m1 = g (which doesn't depend on mass of spring)

now consider block of mass m which you kept on the spring,

force on it by the earth = mg, => accelaration of the block downwards = F/m = mg/m = g which is same as the above,

so, both spring and block have same accelaration = g, hence they do not exert any force on each other, hence weight of the mass on spring is zero

this implies that all freely falling bodies have same accelaration which doesn't depend on the mass of the respective bodies.

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