The platform P, has negligible mass and ...

The platform P, has negligible mass and is tied down so that the 0.4-m-long cords keep a 1-m-long spring compressed 0.6 m when nothing is on the platform. If a 2-kg block is placed on the platform and released from rest after the platform is pushed down 0.1 m, Task Fig. 2.2(b), determine the maximum height h the block rises in the air, measured from the ground. ( Hint: the strain energy in the spring is transferred into potential energy in this process.)