Atruck traveling at 75 mi/h has a braking efficiency of 70%. the coefficient of road adhesion is 0.80. ignoring aerodynamic resistance, determine the theoretical stopping distance on a level grade.

100.36 m

Explanation:

Given

speed of truck

Braking efficiency of 70 %

i.e. braking declaration will be 70 % of frictional force

effective acceleration

using equation of motion

where v=final velocity

u=initial velocity

a=acceleration or declaration

s=displacement

here v will be zero

true tan speed = ang vel x radius

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