The Atwood machine for different mass ratios

An Atwood machine has a heavy block of $1.5\ \text{kg}$ on one side and a lighter block on the other. As the lighter block gets heavier, the machine slows down. You will make the program find the acceleration and the tension for every mass ratio, and the ratio that gives a quarter of $g$.

The idea. With $m_2 = r\,m_1$ and $r < 1$,

Your tasks.

1. Work out the acceleration for every ratio in r.
2. Work out the tension for every ratio.
3. Find the ratio whose acceleration is closest to $\dfrac{g}{4}$.