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2 Comments Already

monkeysofthebutt Said,
February 2nd, 2011 @5:56 am  

Its been 2 years since I’ve taken physics but I’m fairly sure my interpretation is correct. 1J = 1Nm. In order to stop the brakes must exert a force equal to that of the kinetic energy of the car. You can visualise this in two ways either Fc/D=Fb ((N*m)/m)=N) or Fc=D*Fb (N*m=N*m) where Fc is the force of the car, Fb is the force of the brakes, and D is the distance needed to stop. 75000=3750*D 75000/3750=D 20m=D

Captain Mephisto Said,
February 2nd, 2011 @6:21 am  

Think about the energy.
Before stopping = 75000 J
After stopping = 0 J

This change in energy is caused by the brakes and so the work done by the brakes must be equal to this.

W = F*d
75000 = 3750*d
d = 20 meters

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