A spring of spring constant $5 \times {10^3}\,N/m$ is stretched initially by $5$ $cm$ from the unstretched position. Then the work required to stretch it further by another $5$ $cm$ is
$12.50$ $N$-$m$
$18.75$ $N$-$m$
$25.00$ $N$-$m$
$625$ $N$-$m$
Solution
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