The speed of a car is decreased uniformly from 30. meters per second to 10. meters per second in 4.0 seconds. what was the car's acceleration ?

i was thinking more like reflects green light, just not sure

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.