Question

A car is running at the rate of 72 km/h, when suddenly brakes are applied so as to stop the car within
10 m. Find the force of brakes.​

Answer 1

Answer:

v^2-u^2=2as

0^2-20^2=2a*10

-20^2=2a*10

-400=2a*10

-400/10=2a

-40=2a

a=-40/2

a=-20m/s^2

f=ma

=100*(-20)

=-2000N