Answer:
The acceleration = -40 ms⁻²
Step-by-step explanation:
We know that,
a = (v₂ - v₁) / t
= 0 - 20 / 0.5
= -20 / 0.5
= -40 ms⁻²
Thus, the acceleration = -40 ms⁻²
- Note: negative sign gives us an idea the car is slowing down after a collision with the barrier, thus acceleration and velocity is in opposite direction.