During the lanuch from a board, a diver's angular speed about her centre of mass changes from zero to 6.20 rad/s in 220 ms. Her rotational inerita about the centre of mass is `"12.0 kg-m"^2`. During the launch, what is the magnitude of :
the average external torque acting on her from the board ?

Explanation

To solve the problem, we need to determine the average external torque acting on the diver during her launch from the board. We can use the relationship between torque, rotational inertia, and angular acceleration.

### Step-by-Step Solution:

1. **Identify the given values:**
- Initial angular speed, \( \omega_i = 0 \) rad/s (since it starts from rest)
- Final angular speed, \( \omega_f = 6.20 \) rad/s
- Time interval, \( t = 220 \) ms = 0.220 s
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