If F = ma, then how do objects going at a constant speed generate force?

Question

For example, a car hits a brick wall. But the car was traveling at constant speed. Zero acceleration.

In: Physics

Answer 1

>For example, a car hits a brick wall. But the car was traveling at constant speed. Zero acceleration.

Could you elaborate on how you arrive at zero acceleration?

A car moving at a constant 30m/s, then hitting an obstacle and coming to a full stop over the course of a second experiences an acceleration of -30m/s^2 during that crash.