- #1

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## Homework Statement

Suppose 2 J is needed to stretch a spring from it's natural length of 35 cm to 42 cm. How much work is needed to stretch it from 35 cm to 40 cm?

## Homework Equations

W=FD

F = KX

## The Attempt at a Solution

2 = 12K

K= 1/6

Work = Integral from .35 to .4 of (1/6)X

(1/6)(x^2/2) from .35 to .4.

.013 - .010 = .033

Wrong.