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-   -   CALCULUS! Related rates (https://www.askmehelpdesk.com/showthread.php?t=167623)

  • Jan 1, 2008, 10:56 AM
    LMTSML
    CALCULUS! Related rates
    I have this related rates problem, but I keep getting a negative number for dx/dt... heres the problem.. HELP!

    A person is hanging a banner along the side of a wall by a rope tied to the top of the bar. The banner is 5 meters long. If the person pulls the banner up at a rate of 0.5 meters per second. How fast is the bottom of the banner sliding across the ground when it is 3.0 meters from the wall?

    I keep getting that dx/dt is -2/3 meters per second.. how can that be?
    HELP! PLEASE! Thank you!
  • Jan 1, 2008, 11:01 AM
    galactus
    That is correct. Good work. The reason it is negative is because the banner is sliding toward the wall. If it were going away it would be positive.
  • Jan 3, 2008, 01:56 AM
    mustapha
    integrate 2^x+4y-2x

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