if a 1500kg car moving with velocity of 50m/s is suddenly decelerate to a stop.its acceleration during this period is -10m/s2,and it takes 50m for the the car come to a complete stop.the coefficient of the friction is 0.8.
if i want to calculate the force of the friction,which formula should i use?F=Ma or f=N*µ?why?what's the difference?will these two results come up to be the same?(i make up those data)