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A spring of natural length ll is compressed vertically downward against the floor so that its compressed length becomes l2\displaystyle\frac{l}{2}. On releasing, the spring attains it's natural length. If kk is the stiffness constant of the spring, then the work done by the spring on the floor is

হানি নাটস

Only the center of mass of the spring changes, but the floor has no displacement.

W=F.xW=F.x

W=F×0W=F\times0

W=0W=0

Hence the work done by the spring on the floor is zero.

Option A.

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