A car is moving with a velocity of 18 m/s when the brakes are applied and the wheels lock (stop spinning). The car then slides to a stop in 42 m. Find the coefficient of kinetic friction between the tires and the road

Question

anonymous · Answer

So what do you think? How can you begin solving this problem?
to calculate Coefficient of kinetic friction what do you need to calculate first?

anonymous · Answer

i dont know thats why im askking

anonymous · Answer

find retardation first...

roadjester · Answer

$$\huge \vec f_k=\mu_k \vec n$$

anonymous · Answer

oh.....yeah that sure does help a bunch............... @divu.mkr

anonymous · Answer

i appreciate it. that means that in its rearranged form it is:  u = f / N right?

roadjester · Answer

f_k is the friction force
n is the normal force

as I said this afternoon, draw free body diagrams

anonymous · Answer

ok, i have found my answer

roadjester · Answer

Is it correct?

anonymous · Answer

yes. it came out to .39