Motion with constant acceleration help

[radl223]

Hi everyone,

Can anyone please help me with the second part of the question?

PART 1 (ALREADY SOLVED, just here for background knowledge)
You are driving down the highway late one night at 20 m/s when a deer steps onto the road 35 m in front of you. Your reaction time before stepping on the brakes is 0.50 s , and the maximum deceleration of your car is 10 m/s2 . How much distance is between you and the deer when you come to a stop?
I worked this out and got 5m.

Then, PART B
You found the distance that you will cover while braking. You can use the expected amount of time for braking to check your answer for distance.
Using the information given in the introduction and the value for distance that you found above, determine the time required for you to stop once you press the brakes. Note that the time for braking is just the time interval t3−t2.
I have no idea what this question is asking. I think t2=0.5 (reaction time), but I don't have a clue what t3 is. What is t3 and how do you work it out?

Thankyou

[PB]

lol what the...this question makes no sense to me either Just skip it IMO, find other better questions to do!