Answer:
200 Years
Step-by-step explanation:
0.5% X 10 = 5% Increase. So after 10 years 5% Increase
0.5% X 100 = 50% increase. So after 100 years 50% Increase
0.5 X 200 = 100% Increase. So after 200 years it will double.
According to the Question,

<h3>From the Question,</h3>
- Initial Acceleration,a = 5 m/s²
- Force at a = 5 m/s²,f = 25 N
- Final Acceleration,A = 9 m/s²
<h3>To find</h3>
Force exerted on the object at a = 9 m/s²
We Know that,

Firstly,we need to find the mass of the object
Thus,

Now,

You need to post a graphic. I tried drawing my own, but I do not know where point "P" is nor where point "R" is.