The rubber cord of a catapult has cross-...

The rubber cord of a catapult has cross-section area 1 `mm^(2)` and a total unstretched length 10 cm. It is stretched to 12 cm and then released to project a partical of mass 5 g. Calculate the velocity of projection (Y for rubber is `5xx10^(8)N//m^(2)`)

5 `ms^(-1)`

10 `ms^(-1)`

20 `ms^(-1)`

40 `ms^(-1)`

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