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A catapult consists of two parallel rubb...

A catapult consists of two parallel rubber cords each of length `20cm` and cross-sectional area `5cm^(2)`. When stretched by `8cm`, it can throw a stone of mass `4gm` to a vertical height `5m`, the Young's modulus of elasticity of rubber is `[g = 10m//sec^(2)]`

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