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If the distance is decreased by 4 times, the force of gravity between the two bodies is one-eighth as weak as before.

Explanation:

The force of gravity between two bodies depends on the mass and distance. But we will focus on distance since that's what the question asks. Therefore, the force of gravity increases as distance between the bodies decreases.

The gravitational force between two bodies is inversely proportional to the square of the distance between them.

So if the distance is divided by 4, the force is multiplied by 16.

It will take 6 years and 183 days to cover for the investment.

Explanation:

Giving the following information:

Cash flow:

Cf1 trough 3= 100

Cf4 trough 8= 75

Initial investment= 475

The payback period is the time required to recover the initial investment.

Year 1= 100 - 475= -375

Year 2= 100 - 375= -275

Year 3= 100 - 275= -175

Year 4= 75 - 175= -100

Year 5= 75 - 100= -25

Year 6= 75 - 25= 50

To be more accurate:

(25/50)*365= 183

It will take 6 years and 183 days to cover for the investment.