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Define strength and work. How do you calculate the force made by moving an object a...

Define strength and work. How do you calculate the force made by moving an object a a b.
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to. A force of six pounds is required to keep a spring stretched ½ foot from its normal length. Find the value of the spring constant and the work done stretching the spring ½ foot from its normal length. How much work is done by stretching it 2 feet?
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