A car of mass 600 kg is travelling at 10m/s. when the brakes are applied, it comes to rest in 10 m.what is the average force exerted by the brakes?

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aruv | High School Teacher | (Level 2) Valedictorian

Posted on

mass of car=600 kg

initial velocity u = 10 m/s

distance s= 10m

final velocity v=0    (car stop)

By equation of motion

`v^2=u^2+2as`

`0=10^2+2xxaxx10`

`a=-100/20=-5 ` m/s^2 ( retardation )

Thus by Newton's second law of motion ,retarding force is

`F=600(-5)=-3000` N

Thus force break exert = 3000N.

 

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