Physics, A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree...

A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration in meters per second per second of the car?

I need an explanation, please. Let your answer be clear and easy to understand

the definition of acceleration is change in velocity/time

in physics, the change in a parameter is always the final value - initial value

so, we have

acceleration = (final velocity - initial velocity)/time = (0-22m/s)/0.1s = -220m/s/s