Physics

An 800kg car moving at 80kmh^-1 collides with a 1200kg car moving at 40kmh^-1 in the same direction. If the car sticks together, calculate their common speed

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  1. conserve momentum.
    800*80 + 1200*40 = (800+1200)v

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    oobleck
  2. 60 kmph

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