a If the about 60 myh tires and dry b On wet pavement the co

(a) If the (about 60 myh) tires and dry (b) On wet pavement the coefficient of inetic friction may be only 0.26, How fast should you drive on wet pavement in arder to be able to stop in the same distance as in part (a)j? (e brakes is not the safest way to stop.) m/s

Solution

a) Here,

initial velocity , u = 26.2 m/s

coefficient of kinetic friction , u = 0.81

for the acceleration , a = u * g

a = 0.81 * 9.8

a = 7.94 m/s^2

Now, for the distance d

0^2 - 26.2^2 = 2 * d * 7.94

d = 43.2 m

the shortest distance is 43.2 m

b)

for the wet road

initial velocity , u = 26.2 m/s

coefficient of kinetic friction , u = 0.26

for the acceleration , a = u * g

a = 0.26 * 9.8

a = 2.55 m/s^2

Now, for the distance d

0^2 - 26.2^2 = 2 * d * 2.55

d = 134.6 m

the shortest distance is 134.6 m