A box of mass 4.00 kg is attached to a spring of force constant k = 350 N/m. The block is pulled to the right 35 cm away from the equilibrium point and released from rest. The block and spring are on a frictionless surface. a) What is the speed of the block at the equilibrium point? b) What is the frequency of the motion of the block? c) What is the acceleration of the block after 2 seconds?