Two masses connected by a mass less spring .are placed on a horizontal smooth surface. The spring is initially compressed by 3 cm. The system is released from rest. The velocity (in m/s) of the 2 kg mass, when spring attains natural length is to

• A. \[\sqrt{\frac{3}{2}}\]
• B. \[\sqrt{\frac{2}{3}}\]
• C. \[\frac{3}{2}\]
• D. \[\sqrt{3}B=\left( 1/5\text{ }x\text{ }30 \right)\]