# Acceleration Question* * (Physics 11)

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.

## The Attempt at a Solution

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

$$d_{remain} = 40.0 - d_{react}$$