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31 Oct 2009 20:18:40 IST

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An elastic spring has a length (L1) when tension in it is 4N, its length is (L2) when tension in it

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An elastic spring has a length (L1) when tension in it is 4N, its length is (L2) when tension in it is 5N. what will be its length when tension in it is 9N ?

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VARUN RAJ

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31 Oct 2009 21:16:32 IST

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simple sum with a twist .... 4=k(l1-l) 5=k(l2-l) and 9=k(l3-l) where k is the natural lenght of the spring and l3 is the extension of the spring when a force of 9n is applied

Bipin Dubey

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31 Oct 2009 21:42:48 IST

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Let the natural length be L.

4 = k (L₁ - L)

5 = k (L₂ - L)

9 = k(L₃ - L)

from these three : L₃ = 5L₂ - 4L₁

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