A car skids on a horizontal road. It is modelled as a particle for which the only horizontal force is friction of magnitude μR\mu RμR. The car decelerates at 3.43 m s−2^{-2}−2. Take g=9.8g=9.8g=9.8 m s−2^{-2}−2.
Show that the deceleration has magnitude μg\mu gμg.
Find μ\muμ.