A skid average is measured at 30 feet from a vehicle that has a breaking efficiency of 100% on a road surface of. 56 what is the MIS of the vehicle

Question

Distance is 35 Velocity is 44.73

Answer 1

Kinetic energy of vehicle where m=mass and v=velocity is ½mv².

If 0.56 is µ, the coefficient of friction, the frictional force is µmg=17.92m where g=32ft/s².

The work done by friction=537.6m acting over 30 feet.

This counterbalances the KE of the vehicle so 537.6m=½mv². So v²=1075.2 and v=32.79fps=22.36mph approx. (36kph).