Find the work done by the spring force as the bloc k is moved leftward from `x_(1)=15mm` to `x_(z)=-10mm` value of spring constant is 400

Explanation

To find the work done by the spring force as the block is moved from \( x_1 = 15 \, \text{mm} \) to \( x_2 = -10 \, \text{mm} \), we will follow these steps:

### Step 1: Identify the spring constant and the initial and final positions.
- Given:
- Spring constant \( k = 400 \, \text{N/m} \)
- Initial position \( x_1 = 15 \, \text{mm} = 15 \times 10^{-3} \, \text{m} \)
- Final position \( x_2 = -10 \, \text{mm} = -10 \times 10^{-3} \, \text{m} \)

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