Question: If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work (in ft-lb) is needed to

 If the work required to stretch a spring 3 ft beyond

its natural length is 15 ft-lb, how much work (in ft-lb) is

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work (in ft-lb) is needed to stretch it 18 in. beyond its natural length? ft-lb

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