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Homework Statement
Homework Equations
The Attempt at a Solution
Suppose the free end of hte spring moves towards right .Consider a reference frame moving with speed 'v' along with the free end of the spring .
From this frame ,the block has an initial speed 'v' towards left . At maximum elongation of spring ,the speed of the block is zero .
Applying Conservation of energy ##\frac{1}{2}mv^2 = \frac{1}{2}kx^2## .
Total mechanical energy at any instant from this frame is ##\frac{1}{2}mv^2## . But this is incorrect .
Could someone help me with the problem .
Thanks .
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