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**1. The coefficient of static friction between the tires of a car and a dry road is .62. The mass of the car is 1500 kg. What is the maximum braking force is obtainable:**

a. horizontal to the road.

b. on an 8.6 degree downgrade?

a. horizontal to the road.

b. on an 8.6 degree downgrade?

**2. F=mA f(s)=M(s)N N=mg F=f(s)-mgsin(x)**

**3.**

a. f(s)=.62(9.8)(1500)sin90=9114 N

b. f(s)=.62(9.8)(1500)sin8.6=2198 N

a. f(s)=.62(9.8)(1500)sin90=9114 N

b. f(s)=.62(9.8)(1500)sin8.6=2198 N

My problem is that "b" isn't correct, I checked the back of the book I was using and they got 9000 N. Can anyone show me how to do this problem? I know I suck at physics. Also, if possible, can anyone explain to me how to find the tension of a string? Thanks!