A spring with a constant $3$x$10^4$ N$/$m is attached to the output piston of a hydraulic lever. The other end of the spring is attached to a mass of $1000$ kg that is initially held by stationary. The area of the input piston is A$1$ and the area of the output piston is A$2=150$ A$1.$ How much mass much be added to compare the spring by $5$ m$?$ If the mass is then allowed to move, what us the angular frequency of the harmonic motion caused by the spring?