The potential energy of a certain spring when stretched through a distance 'S' is 10 joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance 'S' will be _____?
Answer: 30 J
Explanation
Spring potential energy is given by U = 1/2kx².
If stretching to distance S gives 10 J, then to stretch to 2S, the energy becomes 1/2k(2S)² = 4×10 = 40 J.
So, additional work = 40−10 = 30 J.
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