1.

When the load on a wire increased slowly from `2 kg wt.` to `4 kg wt.`, the elogation increases from `0.6 mm` to `1.00 mm`. How much work is done during the extension of the wire? `[ g = 9.8 m//s^(2)]`A. `14xx10^(-3)J`B. `0.4xx10^(-3)J`C. `8xx10^(-2)J`D. `10^(-3)J`

Answer» `W=((1)/(2)F_(2)xxDeltal_(2))-((1)/(2)F_(1)xxDeltal_(1))=20xx10^(-3)-6xx10^(-3)=14xx10^(-3)J`


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