As physics
posted by cylinder .
Q11.The table below shows how the braking distance x for a car depends on its initial speed u.
 u / ms1  5  10  20  40 
 X / M  2  8  32  128 
The relationship between x and u is: doubling speed increases distance by a factor of 4.
i)The reaction time of a driver is 0.60s. Calculate the stopping distance of the car when u is 30ms1.
Thinking distance= 18m
and i didn't know how to work out braking distance so i looked at the mark scheme to get this number
so braking distance=72m
then i used this number to get the stoppign distance and got:
stopping idstamce=
18m + 72m = 90m stopping distance.
Please show mehow to work out braking distance for this questions, show where you got numbersfrom, what equations used and full wqriting not jut symbols please/
by the way for the table
5 is above 2
10 is above 8
and so on
the space i left aren't posted/shown

Damon As physics 
cylinder
I reposted like you asked and i included the full question and my working out and what i need help with so pplease help
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