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A 12100 kg railroad car travels alone on a level frictionless track with a constant speed of 20.5 m/s. A 5850 kg load, initially at rest, is dropped onto the car. What will be the car's new speed?

  • physics -

    An application of the law of conservation of linear momentum, in the horizontal direction, will tell you the answer.

    Give it a try.

    Adding a load by dropping from above will not change the horizontal momentum.

  • physics -




  • physics -

    umm, im sorry about that answer, but really? 131 thousand meters per second? might want to check your math there, that's 131 kilometers per second which is pretty fast...

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