What is the acceleration of a car that maintains a constant velocity of 109 mi/hr for 42 min.? 

When a car is moving at a constant velocity, it means that its speed is not changing. Since acceleration is the rate of change of velocity over time, the acceleration of the car is zero in this case.

### Formula for Acceleration:
\[
\text{Acceleration} = \frac{\Delta v}{\Delta t}
\]
Where:
- \(\Delta v\) is the change in velocity.
- \(\Delta t\) is the change in time.

Since the velocity does not change (\(\Delta v = 0\)), the acceleration is:
\[
\text{Acceleration} = \frac{0}{\Delta t} = 0
\]

Thus, the car's acceleration is **0**.

Would you like more details or have any questions?

Here are 5 related questions:
1. What is the relationship between velocity and acceleration?
2. How do you calculate average velocity over a time interval?
3. Can a car have acceleration if it moves in a circular path at constant speed?
4. How would you calculate acceleration if the velocity were increasing?
5. What are some units commonly used for acceleration?

**Tip**: Constant velocity implies zero acceleration; however, direction changes can still introduce acceleration even at a constant speed (centripetal acceleration).

What is the acceleration of a car that maintains a constant velocity of 109 mi/hr for 42 min.?

Understand why a car maintaining a constant velocity of 109 mi/hr for 42 minutes has an acceleration of zero. This solution explains the relationship between velocity and acceleration using the formula Acceleration = Δv / Δt, suitable for Grades 9-10.

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