A torque of `20 N-m` is applied on a wheel initially at rest. Calculate the angular momentum of the wheel after `3` sec.

Explanation

To solve the problem of calculating the angular momentum of a wheel after a torque is applied, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between torque and angular momentum**:
The torque (\( \tau \)) applied to an object is related to the change in angular momentum (\( L \)) over time (\( t \)) by the equation:
\[
\tau = \frac{dL}{dt}
...