- #1
Probie1
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Homework Statement
Car 1 weighing 1000 kg crashes into the rear of parked car 2 weighing 1100 kg and stops. Car2 moves ahead 2 ms2. What is the velocity of car1 at impact?
Homework Equations
(m1v1+m2v2)=(m1v3+m2v4)
The Attempt at a Solution
(m2V4)/m1
(1100*2)/1000
2.2ms2= 2200/1000
Okay, now I know this is right, but what I don't know is how do they arrive at the equation (m2v4)/m1 ?