How Does Friction Affect a Car's Maximum Acceleration?

[kneu]

Homework Statement

A rear-wheel-drive car supports 42% of its weight on its two drive wheels and has a coefficient of static friction of 0.80.

What is the car's maximum acceleration?

Assuming infinite engine power, how long will it take the car to reach 105 km/h?

Homework Equations

F_g = mg

µ_s(F_n) = F_f

The Attempt at a Solution

Unsure how to begin problem, D;.

 

[PhanthomJay]

What is u_s(F_n) on the rear tires? That's the friction force that accelerates the car forward per Newton's 2nd law. What is the car's acceleration, and then find the time it takes to reach the given speed?

 

[kneu]

Ya I know what I'm supposed to find, it says that in the problem. To be honest the second part of the problem is easy once the first part is done. I just don't know how to go about starting the first part.

 

[PhanthomJay]

use Newton 2, F_net =ma, where F_net is the maximum available horizontal force acting forward on the rear tires. What is that force?