What are the angular frequency and the period of the resulting oscillation.?

A 680 gram block is fastened to a spring whose force constant is 65.0N/m. The block is pulled 11cm from its equilibrium position at x=0 on a smooth surface and released from rest at time t=0. What force does the spring exert on the block just before it is released? What are the angular frequency and the period of the resulting oscillation?