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[" An iron rod of length "2m" and eross-...

[" An iron rod of length "2m" and eross-sectional area of "50mm^(2)],[" stretched by "0.5mm" ,when a mass of "250kg" is hung trom its "],[" lower end.Young's modulus of iron rod is "],[[" (i) "19.6times10^(20)N/m^(2)," (b) "19.6times10^(18)N/m^(2)],[" (c) "19.6times10^(10)N/m^(2)," (d) "19.6times10^(15)N/m^(2)]]

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