Generate a video that showcase the following scene: A mass-spring system can be seen. The spring has a stiffness of 20g/cm and the weight attached to this spring is 200g. Initially the spring is at a length of 5cm and a platform supporting the weight is removed. This causes the spring to oscillate. This oscillation continues for a significant amount of time. The maximum length of the spring is 25cm. The video stops after the oscillation has occoured for several times.