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An SUV with a mass of 1.80×103 kg is travelling eastbound with a speed of +15.0 m/s,
while a compact car with a mass of 9.00×102 kg is travelling westbound at -15.0 m/s.
The vehicles collide head-on and stick together. What is the speed of the wreck
immediately after the collision, and which way does it move?

  • physics -

    m₁v₁ - m₂v₂ =(m₁+m₂)u
    u= (m₁v₁ - m₂v₂)/(m₁+m₂)=
    =13500/2700=5 m/s (eastbound)

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