A steel wire of initial length 149 cm extends by 0.5 cm when a tension of 50 N is applied along its length. If an additional tension of 100 N is applied to the same wire, then the final length of the wire is
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Within elastic limit:
\[
\frac{\Delta L_1}{\Delta L_2}
=
\frac{F_1}{F_2}
\]