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latte

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Here goes..

during the investigation of a traffic accident, police find skid marks 90m long. They determine the coefficient of friction between the car's tires and the roadway to be .5 for the prevailing condition. Estimate the speed of the car when the brakes were applied.

choices are:

a. 9.49 m/s

b. 21

c. 29.7

d. 42

Here's how far i got .

givens:

d=90m

coeff=.5

vf=0

vi?