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To find Jamal's resultant velocity, we need to consider both the velocity of his jet-ski and the velocity of the river, taking into account that they are moving in opposite directions.

### Given:
- **Jet-ski velocity (north)**: \( 24.6 \, \text{m/s} \)
- **River velocity (south)**: \( 9.0 \, \text{m/s} \)

### Approach:
Since the jet-ski is moving north and the river is flowing south, the velocities are in opposite directions. The resultant velocity \( v_{\text{resultant}} \) can be calculated as:

\[
v_{\text{resultant}} = v_{\text{jet-ski}} - v_{\text{river}}
\]

\[
v_{\text{resultant}} = 24.6 \, \text{m/s} - 9.0 \, \text{m/s} = 15.6 \, \text{m/s}
\]

### Result:
Jamal's resultant velocity is **15.6 m/s north**.

Would you like any further details or explanations?

### Related Questions:
1. What would Jamal's resultant velocity be if the river flowed east instead of south?
2. How would the resultant velocity change if the river's speed increased to 12.0 m/s?
3. If Jamal changed his direction to south, what would his new resultant velocity be?
4. How can we calculate the resultant velocity if the river and jet-ski are moving at an angle to each other?
5. What is the importance of vector addition in determining resultant velocity?

### Tip:
When dealing with velocities in opposite directions, always subtract the magnitudes to get the resultant, taking care to maintain the correct direction.

Jamal drives his jet-ski 24.6 m/s north in the Chattahoochee River, which flows south at 9.0 m/s. What is Jamal's resultant velocity?

Learn how to calculate Jamal's resultant velocity when driving his jet-ski at 24.6 m/s north in a river that flows south at 9.0 m/s. This physics problem involves vector addition and relative velocity, suitable for students in Grades 9-12.

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