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As stone of mass .m. is projected from a...

As stone of mass .m. is projected from a rubber catpult of of length .`l`. and cross-sectional area A stretched by an amount .e.. If Y be the young.s modulus of rubber then find the velocity of projection of stone?

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Strain energy =` 1/2 F.e`
As the stone is released, the strain energy in the catpult appears in the form of kinetic energy of the stone.
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AAKASH SERIES-MECHANICAL PROPERTIES OF SOLIDS-EXERCISE - 3
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