Answer:
If F be the gravitational force on a body of mass m, then \[F=G\frac{Mm}{{{R}^{2}}}=mg\] or \[g=\frac{GM}{{{R}^{2}}}\] Clearly, \[F\propto m\] m but g does not depend on m. Hence all bodies fall with same rapidness if there is no air resistance.
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