Question

12) A car weighing 1200 kg and travelling at a
speed of 20 m/s stops at a distance of 40 m
retarding uniformly. Calculate the force
exerted by the brakes. Also calculate the work
done by the brakes.

Answer 1

Answer:

6000N

Explanation:

f=ma

use 2as=u^2-v^2

Answer 2

final -0

initial-20m/s

distance-40m

formula -2as=v^2-u^2

20*20-0*0/2*40

=400/80=5m/s^2

force = v-u/t

(v-u/t=a)

f=a

force =5N