# As physics

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Q11.The table below shows how the braking distance x for a car depends on its initial speed u.

| u / ms-1 | 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 30ms-1.
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 -

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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