A race of rolling bodies

A solid sphere, a disc, a hollow sphere and a ring roll from rest down a slope $3.0\ \text{m}$ long at $25^\circ$, beside a block that slides with no friction. You will make the program find each one's acceleration and time, and the winner.

The idea. For a body with $I = kMR^2$, rolling without slipping, $a = \dfrac{g\sin\theta}{1 + k}$. From rest, $L = \tfrac12 at^2$.

Your tasks.

1. Work out the acceleration of each body.
2. Work out the time each one takes to reach the bottom.
3. Find the name of the fastest rolling body (leave the block out).