Thursday
November 27, 2014

Homework Help: physics repost

Posted by Anonymous on Wednesday, April 16, 2008 at 8:46pm.

A car of mass 1330 kg is traveling at 28.0 m/s. The driver applies the brakes to bring the car to rest over a distance of 79.0 m. Calculate the retarding force acting on the car.

same as before just posting again so you wont have to scroll. heres my work

KE=1/2*m*v^2
KE=521360

KE=Ff*d
521360*Ff*79.0
521360/79.0
6599.5=Ff
I have to convert that to N, so
6599.5*9.80
= 64675 N what did I do wrong this time?

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