I have a strong hunch that if you read through pages 184 to 187 in the book,
you'll find each of these statements there, with no blank spaces.
1. negative
2. static
3. electrons
4. repel
5. attract
6. static
7. electric current
8. closed or complete
9. open
Answer:
4589.05 year
Explanation:
The relation of activity is given by
we have given
Half life 
We know that half life 

So 



Very good question, The answer you might be looking for is 7.467m/s^2.
Have a blessed day God bless.
You can do this all in one Step
Formula
F2/F1 = 8.5/(25r^2) // 1 / r^2
Solution

The "ks, r^2 and q1 q2" all cancel out
You are left with 8.5/25 as the ratio
- F1 = 5.7 N
- F2 = 8.5 / 25 * F1
- F2 = 8.5 / 25 * 5.7
- F2 = 1.938