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Originally Posted by Wally
OK then lets look at the conservation of energy angle then:
Car A = E1
Car B = E2
E1 = E2
Combined energy is E1 + E2, in a head on the kinetic energy is shared equally between the two.
When Car A hits the immovable wall, energy will still be imparted into the wall as heat, sound waves, etc. The energy acting on the car must be less.
Chopped, did you never play conkers ? The balls not got thud and stop.
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Do any balls go thud and stop if you roll them at an immovable wall?
In an impact between Car1 and Car2, Car1 will impart all of its energy to Car2 and Car2 will impart all of its energy to Car1.
The immovable wall will reflect any impact and therefore impart Car1's energy back to Car1.