Understanding the Concepts

* Acceleration: The rate at which an object's velocity changes over time.

* Initial Velocity (v₀): The starting velocity (0 m/s in this case, since the car starts from rest).

* Final Velocity (v): The ending velocity (100 km/h in this case).

* Time (t): The time it takes to change velocity (4 seconds).

Calculations

1. Convert km/h to m/s:

100 km/h * (1000 m/km) * (1 h/3600 s) ≈ 27.78 m/s

2. Use the acceleration formula:

acceleration (a) = (v - v₀) / t

a = (27.78 m/s - 0 m/s) / 4 s

a ≈ 6.95 m/s²

Answer: The car's acceleration is approximately 6.95 meters per second squared (m/s²).