Acar is traveling at 20meters/seconds and is brought to rest by applying brakes over a period of 4 seconds what is it's average acceleration over this time interval?

v=vo-at<=>0=20-4a<=>4a=20=>a=5 m/s^2

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

answer; (arch); good luck