Question

When a 5N force is applied on a 12 cm long spring. its length becomes 14 cm. Calculate the amount of potential energy stored in the spring if a 15N force is applied.

Answer 1

First find the spring constant of the spring,
by using F=kx,where x is the extension of the spring.
Then,find the extension,when a 15 N force is applied using the same equation.

to find potential energy,you should use:
\[U=1/2kx ^{2}\]