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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 -

    (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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