State whether the following statements are true or false.
a) A falling stone also attracts the earth.
b) The force of gravitation between two objects depends on the nature of medium between them.
c) The value of G on the moon is about one-sixth of the value of G on the earth.
d) The acceleration due to gravity acting on a freely falling body is directly proportional to the mass of the body.
e) The weight of an object on the earth is about one-sixth of the weight on the mmon.