To find the change in spring potential energy of the block-spring, we subtract the final from the initial kinetic energy of the block.
Spring potential energy is simply defined as the Potential energy stored as a result of the deformation of an elastic item, such as the stretching of a spring is referred to as elastic potential energy.
In conclusion, to find the Spring potential energy, we subtract the kinetic energy of the block at the final position from the kinetic energy of the block at the initial position.
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