A wheel starts from rest and accelerates uniformly at 2 rad/s2 for 5 seconds. What is its final angular velocity?

The wheel starts from rest, so the initial angular velocity is $\omega_0 = 0 \text{ rad/s}$.
The constant angular acceleration is $\alpha = 2 \text{ rad/s}^2$.
The time elapsed is $t = 5 \text{ s}$.

To find the final angular velocity ($\omega$) given initial angular velocity, angular acceleration, and time, we use the equation:

The calculated angular velocity is $10 \text{ rad/s}$. This matches option b.

The final answer is $\text{b}$