- #1

- 14

- 0

## Homework Statement

A 1200kg car moving at 20 metres per second stops in a distance of 50m when the brakes are applied.

a) What is the acceleration of the car when it is braking?

b) Find the force applied by the car's braking system.

## Homework Equations

For a) I used the acceleration formula: a=(velocity - initial velocity)/t

Time formula from rearranging: t=s/v

## The Attempt at a Solution

a)

t=s/v

t=50/20=2.5s

velocity=50/2.5=20 metres per second

a=(20-0)/2.5 = 8ms(^-2)[/B]

I do not know how to find the acceleration when BRAKING, and the answer claims that it is 4ms(^-2.)

As for b, I believe that I am unable to attempt it seeing as I am unable to find the acceleration.

Please explain how to do it! I have read through the chapter of my textbook, and am unable to understand. thank you very much!

Last edited: