The graph shows how the compression of a spring changes as the force on it increases. A block is moving along a level surface with no friction towards the spring, as illustrated. The spring stops the block. Once the spring has been compressed by $4.0\,\text{cm}$, the block’s entire kinetic energy has been converted into elastic potential energy in the spring. What is the kinetic energy of the block at the moment it first touches the spring?
- A$0.16\,\text{J}$
- B$0.32\,\text{J}$
- C$16\,\text{J}$
- D$32\,\text{J}$