Answer:
Suppose
two objects of masses 
and 
are lying at a distance r
from each other. The force of gravitation between two objects is given by
(i) The mass
of one object is doubled, i.e., mass
The
gravitational force also doubles, i.e., it becomes twice the original value.
(ii) When the distance between the objects is doubled, i.e., 
the gravitational force,
The
gravitational force becomes one-fourth of the original value.
When the
distance between the objects is tripled, i.e., 3r; the gravitational force is
given by
The
gravitational force becomes 
of the
original force.
(iii) The masses of both objects are doubled, mass of the
object, 
Mass of
second object, 
The
gravitational force is given by
The
gravitational force becomes four times the original value.
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