Homework Help: physics

Posted by xz on Monday, October 18, 2010 at 6:49pm.

At an accident scene on a level road, investigators measure a car's skid mark to be 58 m long. It was a rainy day and the coefficient of friction was estimated to be 0.46. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes.

physics - DopestMoses, Wednesday, October 27, 2010 at 1:56am
Well, friction force is mg*mu(greek letter)

That has to equal m*a
a=g*mu a=(9.8)(.46)=4.508

Vfinal^2=0=Vinitial^2-2*a*d
solve for Vinitial
Vinitial^2=2ad=2(4.508)(58)=522.928
Vinitial=sqr rt(522.928)=22.86761903m/s

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