A long spring, when stretched by a distance $x,$ has the potential energy $u.$ On increasing the stretching to $nx.$ The potential energy of the spring will be
A long spring, when stretched by a distance $x,$ has the potential energy $u.$ On increasing the stretching to $nx.$ The potential energy of the spring will be
- A
$\frac {u}{n}$
- B
$nu$
- C
$n^2u$
- D
$\frac {u}{n^2}$
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