Hi, could someone please help me with this question:
A pop-up toy consists of a head and sucker of combined mass m=1.5kgm=1.5kg stuck to the top of a light spring of natural length l0=0.30m and spring constant k=250Nm^−1. The centre of mass of the system can be taken to be at the top of the spring. The spring is compressed to length l1=0.10m when the pop-up is stuck to the ground.
What height above the ground does the bottom of the unstretched spring jump to when it is smoothly released?