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Find the work done by the spring force a...

Find the work done by the spring force as the bloc k is moved leftward from `x_(1)=15mm` to `x_(z)=-10mm` value of spring constant is 400

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Hint : `x_(i)=+"15 min"`
`x_(f)=-"10 min"`
`W_(s)=(1)/(2)kx_(1)^(2)-(1)/(2)kx_(1)^(2)`
`x_(i)=+15mm, x_(f)=-10mm`
`W_(s)=(1)/(2)k x_(i)^(2)-(1)/(2)kx_(f)^(2)`
`=(1)/(2)k(x_(i)^(2)-x_(f)^(2))`
`=(1)/(2)xx400xx[(15xx10^(-3))^(2)-(-10xx10^(-3))^(2)]`
`=0.025J=25mJ`
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