The Work required equals the potential energy increase:
W = (k/2)[(0.3)^2 - (0.2)^2],
where k is the spring constant.
W = 15*(0.05) = 0.75 joules
a spring with spring constant of 30 N/m is stretched 0.2 m from its equilibrium position.
How much work must be done tostretch it an additional 0.1 m?
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