Question

cle A and particle B, of masses M and 2M respectively, are separated by a
distance d in vacuum. The gravitational force on A due to B is of magnitude F.
(1) What is the magnitude of gravitational force on B due to A?
(11) If the mass of A is doubled and the mass of B is halved, keeping the distance
between them unaltered. what is the magnitude of the gravitational force between
them now?
(iii) If the mass of A and B are both doubled and their distance of separation is also
doubled, what is the magnitude of the gravitational force on A due to B now
(iv) If the situation in (c) above takes place when A and B are at a depth of 20 km in
sea water of density 1020 kg m-3, what will be the magnitude of the gravitational
force on A due to B?
(v) If a third particle C of mass 3M is introduced between A and B, at a distance of
from A on the line joining A and B, what is
(a) the magnitude of gravitational force on B due to A?
(b) the magnitude of gravitational force on B due to C?
(c) the magnitude of the total gravitational force on B?​

Answer 1

a is the right answer as a is answer