A spring of natural length is compressed vertically downward against the floor so…

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

A spring of natural length

l

is compressed vertically downward against the floor so that its compressed length becomes

\frac{l}{2}

. On releasing, the spring attains its natural length. If

k

is the stiffness constant of the spring, then the work done by the spring on the floor is (1) Zero (2)

\frac{1}{2}kl^2

(3)

\frac{1}{2}k\left(\frac{l}{2}\right)^2

(4)

kl^2