The forces of attraction acting between two bodies is :

1. directly proportional to the product of their masses
2. directly proportional to the square of the distance between them
3. inversely proportional to the square of the distance between them
4. both (a) and (c)

The value of gravitational constant G depends on :

1. the nature of the particle
2. the temperature of the particle
3. medium
4. none of these

The gravitational force between two masses is :

1. directly proportional to the product of the masses
2. inversely proportional to the square of the separation between them
3. significant between heavenly bodies, but is insignificant between atomic bodies.
4. all of the above

The gravitational force of attraction between two bodies of masses 60 kg and 40 kg separated by a distance 10 m is : (where G = 6.7 x 10^-11 Nm²kg^-2 )

1. 1.60 x 10^-9 N
2. 2.8 x 10^-11 N
3. 1.0 x 10^-11 N
4. 1.6 x 10^-11 N