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## Homework Statement

please check this link out to make it simpler to understand...

http://www.scribd.com/doc/62694749/MC-Collision1D2

there is a friction block and a spring scale... it gives two measurements (the vertical force and the horizontal force)

F

_{vertical}=88.2 N and

F

_{horizontal}=75.8 N

now i'm suppose to find the coefficient of friction...

and also, i'm suppose to find out if the driver exceeded the 70 km/h speed limit

please help me out!

## Homework Equations

m

_{1}v

_{i1}+m

_{2}v

_{i2}= (m

_{1}+m

_{2})v

_{f}

KE=1/2(m)(v

^{2})

## The Attempt at a Solution

for the mu:

at first, i tried to use the "elementary" method of summation of forces along the axes but since we're talking about collisions, i think i should use the work-energy theorem... but now i don't know how to put mu into the equation:

__KE=1/2(m)(v__

...

^{2})for the speed limit:

well, it's an inelastic collision obviously... one car is at rest but they didn't give out the v

_{i1}of the yellow car...

please help! i ran out of ideas on how to solve this!