# an ideal spring has an extension a when the tension in it is 4N.it length is b when tension is 5N.what is length when tension is 9 n

148 Points
13 years ago

Dear jauneet

let the natural length of spring is l

then F =kx

4 = k*a

k=4/a

and agian  F=kx

5 = k(b-l)

5=4/a (b-l)

b-l = 5a/4

l= b-5a/4

let the length is x when tension is 9N

9 = 4/a (x-l)

9a/4 = x- (b-5a/4)

x = b-5a/4 +9a/4

=b-a

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