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**Acceleration Question*URGENT* (Physics 11)**

Okay well i have a test tomorrow and this is a question that was on my quiz, and i didnt know how to do this:

## Homework Statement

1. A driver of a car going 90.0km/h suddenly sees a barrier 40.0m ahead. It takes the driver 0.75s before she applies the brakes, and the average acceleration during braking is -10.0m/s^2.

a. determine if the car hits the barrier (need to know how you got it, please tell me which equation and why :/ i know this involves 2 steps.)

b. what is the maximum speed at which the car could be moving and not hit the barrier 40.0m ahead? assume acceleration doesnt change.

## Homework Equations

## The Attempt at a Solution

I haven't a clue, need help >.<