In the above question, find the work done by the spring force as the block is moved leftward from `x_(1)=15mm` to `x_(z)=-10mm`.Take spring constant as 400 N/m.

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 can use the formula for work done by a spring:

\[ W = \frac{1}{2} k (x_f^2 - x_i^2) \]

where:
- \( W \) is the work done by the spring,
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