Homework Help: Physics

Posted by Elizabeth on Sunday, April 24, 2011 at 10:58pm.

A railroad car with a mass of 1.93 104 kg moving at 3.24 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.16 m/s.

(a) What is the speed of the three joined cars after the collision?
1 m/s
(b) What is the decrease in kinetic energy during the collision?

Physics - drwls, Monday, April 25, 2011 at 12:54am
(a) Assume and apply conservation of momentum.
1 m/s is not the answer.

(b) The initial total KE is (1/2)*1.93*10^4*(3.24)^2 J
+2*(1/2)*1.93*10^4*(1.16)^2 J

Subtract the final KE from that

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