Homework Help: Physics

Posted by Eden on Tuesday, October 26, 2010 at 12:18pm.

A 930 kg sports car collides into the rear end of a 2500 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.6 m/s before stopping. The police officer, knowing that the coefficient of kinetic friction between tires and road is 0.80, calculates the speed of the sports car at impact.

what was the speed?

Physics - bobpursley, Tuesday, October 26, 2010 at 12:37pm
consider momentum change
momentum before= impulse to stop.
930*v=force*time= force*distance/avgvelocity

930V= mu*totalmass*g*distance*2/V

V=sqrt (2*mu*totalmass*g*distance/930)

I cant see anything wrong with this analysis.
Physics - Eden, Tuesday, October 26, 2010 at 1:58pm
I'm not sure why I keep getting the wrong answer, but I do.

Thanks for the help anyway :D
Physics - Anonymous, Tuesday, October 26, 2010 at 11:00pm
type the following into g00gl and the first result which will yah00answers will help you:The police officer, knowing that the coefficient of kinetic friction between tires and road is 0.80, calculates the speed of the sports car at impact.
Physics - Anonymous, Saturday, June 16, 2012 at 10:04pm
blah blah blah

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