The platform P, shown in Fig. 14-12a, has negligible mass and is tied
down so that the O.4-m-Iong cords keep a I-m-Iong 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,
Fig. 14-12b, determine the maximum height h the block rises in the
air, measured from the ground