1. Understand the Concepts

* Initial velocity (u): The car starts at 10 m/s.

* Acceleration (a): The car accelerates at 5 m/s². This means its velocity increases by 5 meters per second every second.

* Time (t): We want to find the speed after 3 seconds.

2. Use the Equation

The equation that relates initial velocity, acceleration, time, and final velocity is:

v = u + at

Where:

* v = final velocity

* u = initial velocity

* a = acceleration

* t = time

3. Plug in the Values

* v = 10 m/s + (5 m/s² * 3 s)

4. Calculate the Final Velocity

* v = 10 m/s + 15 m/s

* v = 25 m/s

Answer: The speed of the car after 3 seconds would be 25 m/s.