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An elastic string of length 42 cm and cr...

An elastic string of length `42 cm` and cross section area `10^(-4) m^(2)` is attached between two pegs at distance `6 mm` as shown in the figure. A particle of mass `m` is kept at midpoint of string stretched as shown in figure by `20 cm` and released. As th string attains natural length, the particle attains a speed of `20 m//s`. Then young modulus `Y` of string is of order (A) `10^(@)` (B) `10^(12)` (C) `10^(8)` (D) `10^(4)`

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