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Math Help - please calculus 2 question about work

  1. #1
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    please calculus 2 question about work

    helping nephew with paper. its english from paper, so i type exactly:


    1. a particle is moved along the x-axis by a force that measures \frac{15}{(1+x)^2} pounds at a point x feet from the origin. Find the work done in moving the particle from the origin to a distance of 14 feet.

    i have no book.

    other problem also about work:

    1. If 128 J of work are needed to stretch a spring from 8cm to 12cm and another 432 J are needed to stretch it from 12cm to 18 cm. What is natural length of spring?

    i am elementary math teacher in italia, so don't remember from college! thanks you everybody!
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  2. #2
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    \displaystyle W=\int_{a}^{b}F(x)dx\rightarrow\int_0^{14}\frac{15  }{(1+x)^2}dx
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