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Integration limits

  1. Feb 22, 2014 #1
    is the upper limit always greater than the lower limit in integration?

    what should be the limits if we need to calculate total work done in bringing a mass from infinity to distance r from earth.
  2. jcsd
  3. Feb 22, 2014 #2


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    ##\int_a^b f(x) \, dx = - \int_b^a f(x) \, dx##.
  4. Feb 22, 2014 #3


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  5. Mar 11, 2014 #4
    There is decrease in potential energy of system. So, negative work is done. -{infinity to r}
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