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)`)
A. 5 `ms^(-1)`
B. 10 `ms^(-1)`
C. 20 `ms^(-1)`
D. 40 `ms^(-1)`