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One end of a fixed spring is pulled by a...

One end of a fixed spring is pulled by an average force of `10N` through a distance of `5cm`, find the work done by the spring.

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`W=-k/2(x_2^2-x_1^2)=-k/2(x_2+x_1)(x_2-x_1)`
`=-((kx_2+kx_1)/(2))(x)=-((F_1+F_2)/(2))x=-F_(av)x`
`=-10xx5/100=0.5N`
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