Constant Acceleration: find time

[Akar]

Homework Statement

A man was driving a car at 78 km/h, he saw a deer at the distance of 101m, how much time is needed so that the car slows down after it drove 99m and stops.

Homework Equations

Δx = 1/2 (v_i + v_f) * t​

The Attempt at a Solution

I'm thinking about finding the Δx

 

[haruspex]

I'm thinking about finding the Δx

not sure I understand. Are you saying you do not know how to determine Δx? It is given.

 

[gneill]

Homework Statement

A man was driving a car at 78 km/h, he saw a deer at the distance of 101m, how much time is needed so that the car slows down after it drove 99m and stops.

Homework Equations

Δx = 1/2 (v_i + v_f) * t​

The Attempt at a Solution

I'm thinking about finding the Δx

Aren't you given the Δx? How far did the car drive until it stopped?

Edit: Oops! @haruspex got there before me!