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A spring has a natural length of 10 in. An 800-lb force stretches the spring to 14 in. (a) How much work is done in

A spring has a natural length of 10 in. An 800-lb force stretches the spring to 14 in.
(a) How much work is done in stretching the spring from 10 in. to 12 in.?
(b) How far beyond its natural length will a 1600-lb force stretch the spring?

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