A mass of 2.50 Kg is pushed against the horizontal spring of force constant 25.0 N/cm on a frictionless air table. The spring is joined to the tabletop, and the mass is not joined to the spring in any way. If the spring has been compressed adequate to store 11.5 J of potential energy in it, the mass is suddenly liberated from rest. Determine the greatest speed the mass reaches, when does it take place? Determine the greatest acceleration of the mass and when does it take?