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college physics

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a railway freightbcar whose mass is 15 000kg & speed is 2.4m/s runs into a stationary freight car whose mass is 25 000kg. the 2 cars couple & roll off the track. what is the speed if the 2 cars as tey move together down the track? and how much kinetic energy is lost in the collision?

  • college physics -

    a. use conservation of momentum.

    (m+M)V=m*2.4+M*0 solve for V.

    Next,
    lost KE= initial KE-final KE=1/2 m*2.4^2-1/2 (m+M)V^2

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