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9giddjl

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**reaction time, beraking deceleration..Please help:)**

## Homework Statement

A pedestrian steps on to the road while an approaching car is traveling at 30 km/h. If the driver's reaction time is 0.3 s and the braking deceleration is 4.5 m/s, calculate a) the stopping distance; (b) the stopping time

## Homework Equations

v2=u2 + 2as?

## The Attempt at a Solution

I tried to work out the stopping distance by converting u=30 km/h to m/s then i used the equation s=(u+v)*t/2 but I am not familiar with all this reaction time stuff? and also i know the final speed is 0 but how can i find all the information with the reaction time and the breaking deceleration?

Could someone please help me:) I would really appreciate it! Thankyou very much