A truck travelling due to north at `20m s^(-1)` turns west and travels at the same speed. Find the change in its velocity.

Explanation

To find the change in velocity of the truck as it turns from traveling north to traveling west, we can follow these steps:

### Step 1: Define the Initial and Final Velocities
- The truck is initially traveling due north at a speed of \(20 \, \text{m/s}\).
- We can represent this initial velocity vector as:
\[ \vec{v_i} = 20 \, \hat{j} \, \text{m/s} \]
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