A car has an initial speed of 23.0 ms-1. In addition, there is also wind blowing in direction similar to the car with a force of 30 N. If the brakes are applied and the car skidded for 10 meters before coming to a halt, determine the kinetic friction of one of the car’s tyre and the road.
The weight and kinetic friction forces on the tires will be different unless the center of mass is midway between the tires. I assume they want you to assume that it is, so that 1/4 of the total frioction force is on each tire.
In that case,
4*Ftire* X -Fwind*X= (1/2)M Vo^2
Solve for Ftire. X = 10 m
The equation says that the work done against sliding friction and the wind equals the initial kinetic energy. The wind work is negative since it comes from behind.