A^2 - b^2 = (a+b)(a-b)
answer :
t^2 - 1
n^2 - 225
For this case we have the following equation:

Where,
w: The weight of a spring in pounds
E: the energy stored by the spring in joules.
Substituting values we have:

Making the corresponding calculation:
Answer:
the approximate weight of the spring in pounds is:
Answer:
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