Given, 
Answer:
(i)
Both of them will fall at the same speed, because acceleration produced in
freely falling bodies is the same for all bodies, irrespective of their shapes
or masses. (1)
(ii) Consider a body of mass m on the surface of the earth, M be mass of
the earth. R be the distance between the body and center of the earth (radius of
the earth) and g is the acceleration due to the earth. Let F be the force
acting on the body.
According to Newton's second law of motion,
F = mg ...(i)
(1/2)
According to Newton's law of gravitation,
?(ii)
(1/2)
From Eqs. (i) and (ii), we get 
thus,
g is independent of the mass of the body. (1)
(iii) 
(1)
Thus, g= 9.8 m/s2 (i)
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