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qwerty159 
Posted: Apr 8 2012, 09:11 PM

Newbie Group: Members Posts: 3 Joined: 2February 11 Positive Feedback: 0% Feedback Score: 0 
A railroad car of mass M moving at a speed v1 collides and couples with two coupled railroad cars, each of the same mass M and moving in the same direction at a speed v2.
(a) What is the speed vf of the three coupled cars after the collision in terms of v1 and v2? (Use M, v_1 for v1, and v_2 for v2 as appropriate.) a) (M*v_1+M*v_2+M*v_2)/(3M) ( How much kinetic energy is lost in the collision? Answer in terms of M, v1, and v2. (Use M, v_1 for v1, and v_2 for v2 as appropriate.) I don't get this I had this for the answer. 1/2*M*[2/3*v_1^2 +4/3*v_1*v_22/3v_2^2] but it is wrong... thanks 
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