Xavier Hernandez

A yo-yo has a rotational inertia of 760 g·cm2 and a mass of 200 g. Its axle radius is 4.0 mm, and its string is 100 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? cm/s2 (b) How long...

just part a...does anyone know how to do it?

I got part a) but how do i do part b) ?

the answer is: (5/x)*(cos(5ln(x))) In this problem: 1. Take the derivative of the cosine 2. Then take the derivative of whatever is inside the cosine. In this case (5ln(x)) 3. Do not change whatever is inside the cosine.

i mean sin wherever it says cosine. My bad