9. A 5.0-cm -radius wheel is mounted on a horizontal axis. A string is wound on the rim of the wheel, and a 50-g mass is suspended from it. After the...

I found the moment of inertia to be 1.25x10^-4 kg m^2 using I=MR^2. Is this correct?

I also would like to see a step-by-step solution to 9b. I'm confused on how to approach the question.

9. A 5.0-cm -radius wheel is mounted on a horizontal axis. A string is wound on the rimof the wheel, and a 50-g mass is suspended from it. After the mass is released, the systemaccelerates in such a way that the mass drops 2.0 m in 1 1.0 s. a) What is the moment ofinertia of the wheel? b) What was the tension in the cord as the mass was falling?