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Perfectly elastic collision 
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#1
Dec308, 08:11 AM

P: 35

1. The problem statement, all variables and given/known data
In an isolated system, cart1 (with mass = 1 kg and vi1 = 2) has a perfectly elastic collision with cart2 (with mass = 2 kg and vi2 = 0). Find the velocity of cart1 and the velocity of cart2 after the collision. I have to solve this using kinetic energy and momentum equations. 2. Relevant equations m1vi1 + m2vi2 = m1v1f + m2v2f 1/2m1vi1^{2} + 1/2m2vi2^{2} = 1/2m1v1f^{2} + 1/2m2v2f^{2} 3. The attempt at a solution I have gotten to this point: 2= V1F + 2V2F 4= V1F2 + 2V2F but I cannot get the numbers to work out correctly. Using another equation I know that V1f = 2/3 and V2f = 4/3 I am doing substitution wrong or something. Please help!! 


#3
Dec308, 11:16 AM

P: 35

I got that by solving the kinetic energy equation.
I mutiplied both sides by 2 to get rid of the halves. It is actually supposed to read: 4 = Vif^2 + 2V2f^2 


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