A block of mass $0\mathrm{.}4$ kg is attached to a spring on a frictionless table and set into simple harmonic motion with a period of oscillation of $2$ s$,$ and an amplitude of $0\mathrm{.}6$ m$.$ A second identical block is dropped onto the first and sticks to it at the point where the block is not moving. What is the maximum speed of the two block system?