Calculating Speed at Time of Collision

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The discussion centers around calculating the speed of Car B at the time of collision with Car A, which was traveling at 5 mph and subsequently rotated 90 degrees after being struck. The forum emphasizes that they cannot provide consultancy on real-life accidents due to legal implications and lack of complete information. They highlight the importance of consulting a certified local expert who can assess the situation with the necessary experience and data. The conversation underscores the complexity of such calculations and the need for professional evaluation. Engaging a qualified expert is strongly recommended for accurate analysis and legal validity.
ANigro
First, let me apologize if I don't give you enough info. If I'm missing something, please let me know and I'll try to get the info.

Here is the set up: Car A is traveling West at 5 mph. Car B is traveling South at X mph. Car B strikes A on the rear quarter panel (centered on the rear tire) causing A to stop moving forward and instead rotate 90 degrees, coming to rest facing North. Car A is a 2010 Mitsubishi Lancer with a full tank (12 gallons) of gas and contains 1 occupant, a 400 lb driver. Car B is a 2015 Kia Soul with an unknown gas level and a 150 lb driver. There were no skid marks, so no attempt to slow down was made before the impact.
 
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I'm sorry, but we cannot give consultancy on any real life accidents for several reasons.
  • We do not regulate who will answer, esp. not their expertise.
  • We cannot give statements with a potentially legal impact.
  • We are not certified.
  • We cannot know the entire situation, regardless how detailed your description might be. I.e. we have neither all variables nor enough statistical nor mechanical data, which a responsible judgement would require.
  • Even an informal answer cannot be given, as we do not have control over its usage.
So as in all of these cases, we strongly recommend to consult a local expert, who can inspect what you are talking about, has sufficient experience and data for comparison, plus most important: is certified, so that his expertise will be of legal value.
 
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For simple comparison, I think the same thought process can be followed as a block slides down a hill, - for block down hill, simple starting PE of mgh to final max KE 0.5mv^2 - comparing PE1 to max KE2 would result in finding the work friction did through the process. efficiency is just 100*KE2/PE1. If a mousetrap car travels along a flat surface, a starting PE of 0.5 k th^2 can be measured and maximum velocity of the car can also be measured. If energy efficiency is defined by...

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