Finding kinetic energy consevered after collision

  • Thread starter qwerty5050
  • Start date
  • #1

Homework Statement


2 cars of equal mass and travelling in opposite directions on a wet and slippery road collide and lock together after impact. Neither car brakes before the collision. The tangled wreck moves off in an easterly direction at 5 m/s immediately after the collision. if one car was travelling due west at 20 m/s immediately before the collision and the other at 30 m/s.
What fraction of the initial kinetic energy as conserved during the collision?

Homework Equations


Ek=1/2mv^2 - this is the only equation i know that has to do with kinetic energy

The Attempt at a Solution


I have no idea what i have to do
 
Last edited:

Answers and Replies

  • #2
gneill
Mentor
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I have no idea what i have to do
Start by listing equations that you think may be relevant. Perhaps that will trigger an idea or two for an attempt.
 
  • #3
Start by listing equations that you think may be relevant. Perhaps that will trigger an idea or two for an attempt.
I've been doing that but I'm still not sure what to do.
 
  • #4
gneill
Mentor
20,913
2,862
I've been doing that but I'm still not sure what to do.
Hmm. You haven't posted any, so we can't tell if you're on the right track or not.

The topic is kinetic energy. What equations do you know pertaining to kinetic energy?
 
  • #5
Suraj M
Gold Member
599
39
Try to think of things that remain constant during the given collision. Any law you know that might apply. Think!
 

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