physics
posted by cindy .
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 headon and stick together. What is the speed of the wreck
immediately after the collision, and which way does it move?

physics 
Elena
m₁v₁  m₂v₂ =(m₁+m₂)u
u= (m₁v₁  m₂v₂)/(m₁+m₂)=
=(1.8•10³•159•10²•15)/(1.8•10³+9•10²)=
=13500/2700=5 m/s (eastbound)
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