Homework Help: Physics

Posted by Shelly on Monday, December 3, 2012 at 6:34pm.

An automobile of mass 2000 kg is driven into a brick wall in a safety test. The bumper behaves like a Hooke’s-law spring. It has an effective spring constant of 5 × 106 N/m, and is observed to compress a distance of 8.7 cm as the car is brought to rest. What was the initial speed of the automobile?
Answer in units of m/s

i used PE=(.5)(k)(d^2)
so
PE=.(.5)(5x10^6)(.087^2) =18922.5

then from there im not sure what do to, did i do that part and where do i go from there?
thanks

When to start wedding dress shopping - When to start wedding dress shopping, Wednesday, April 10, 2013 at 4:22am
I feel like its a silly question lol, but when did you ladies start dress shopping? 
Just to ensure you have enough time to allow for alterations and I guess to allow time to order things in...other things I havent considered, etc haha. Whats a good time frame to work with?
Ive been engaged since late Aug 2012, and the wedding will be Feb 2014, at first I thought id wait until about mid 2
When to start wedding dress shopping - When to start wedding dress shopping, Wednesday, April 10, 2013 at 6:00am
I feel like its a silly question lol, but when did you ladies start dress shopping? 
Just to ensure you have enough time to allow for alterations and I guess to allow time to order things in...other things I havent considered, etc haha. Whats a good time frame to work with?
Ive been engaged since late Aug 2012, and the wedding will be Feb 2014, at first I thought id wait until about mid 2
Help me choose my dress!! - Help me choose my dress!!, Thursday, April 11, 2013 at 6:25pm
Hey ladies 
I have done a bit of shopping around and internet hunting and found I really rea
Am I the only one who doesn't want a White Dress? - Am I the only one who doesn&amp;amp;amp;am, Saturday, April 13, 2013 at 9:15pm
As above. 
We're most likely getting married outside, and around late morning. Even though it's a wedding...to me, a big white gown doesn't fit with the surroundings/situation. 
There are another reason why I don't really want a big white gown either. I don't wear dresses very often but when I do I always buy quality. Wedding dresses seem to be too expensive for the quality they a

Answer this Question

Related Questions

physics - in an air bag test a car traveling at 100km/h is remotely driven into ...
physics - In a particular crash test, an automobile of mass 1369 kg collides ...
physics - A 5kg mass is sliding at a speed of 7 m/s on horizontal sheet of ...
physics - A car is equipped with a bumper that is designed to absorb collisions...
physics - an automobile with the mass of 2000 kg is moving north on a level, ...
Physics - A 6-kg clay ball is thrown directly against a perpendicular brick wall...
statistics - It is claimed that an automobile is driven on the average more than...
Physics - An m = 6.80-kg clay ball is thrown directly against a perpendicular ...
Physics - Please Help - An m = 6.80-kg clay ball is thrown directly against a ...
physics - Leroy, who has a mass of 90 , is skateboarding at 8.6 when he smacks ...

For Further Reading

First Name:
School Subject:
Answer: