1. The problem statement, all variables and given/known data A 1900 kg car moves along a horizontal road at speed v0 = 23.6 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.218 and the kinetic friction coefficient is even lower, μk = 0.1526. The acceleration of gravity is 9.8 m/s2 . Assume: No aerodynamic forces; g = 9.8 m/s2, forward is the positive direction. What is the highest possible deceleration of the car under such conditions? Answer in units of m/s2. 2. Relevant equations Ff=mu*Fn Sum of all Forces = ma 3. The attempt at a solution m = 1900kg Vi=23.6m/s = Fp mus=0.218 muk=0.1526 ay=9.8m/s Fn=(9.8)(1900)=18620 Ff=muk*Fn Ff=(0.1526)(18620) Ff=2841.412N Sum of all forces=ma Ff+Fp=ma (2841.412)+Fp=(1900)a I ran into many problems with this. First of all, in step 1 when using the Ff=mu*Fn I didn't know whether to use the coefficient of static friction or the coefficient of kinetic friction. I assumed it was the coefficient of kinetic friction because the car was already in motion. Is this right? Also, when using the F=ma equation, I was trying to use all of the forces in the x direction to find the acceleration in the x direction. This meant that only the force of friction and the force of the object moving to the right were acting upon the object for this equation. I had already calculated the force of friction, however I couldn't calculate the force of the object moving towards the right, because I only had the initial velocity of the object moving towards the right and you can't convert velocity to force. Where do I go next from here?