Originally Posted by

**sharkman** The gravitational attraction between two masses varies inversely as the square of the distance between them. The force of attraction is 4 lbs. when the masses are 3 ft apart, what is the attraction when the masses are 6 ft. apart?

My Work:

Let g = gravitational attraction force in terms of pounds between two masses.

My equation is: **g = k/d^2**, where k is the constant of proportionality and d is the distance squared.

I know that g = 4.

I also know that 3 = d.

I first need to find k.

4 = k/(3)^2

4 = k/9

4*9 = k

36 = k

Now that I know k, I need to find g.

g = 36/(6)^2

g = 36/36

g = 1 pound.

Is this correct?